Richard Lynn và Tatu Vanhanen did not have a study for Vietnam in IQ and the Wealth of Nations (2002). Then, beginning with their follow-up book, IQ and Global Inequality (2006), Lynn added a bogus study for Vietnam and gave the world’s 13th most populous country a made-up national IQ of 94. In short, Lynn’s dataset does not have an IQ study for Vietnam.

Bạn đang xem: The shameful vietnam war policy that recruited low

In this post I nhận xét two dozen intelligence & achievement chạy thử studies for Vietnam & Vietnamese populations living internationally. While IQ in Vietnam is lower than I anticipated, there is evidence that Vietnamese people have high intellectual potential.

⎻⎻⎻⎻⎻⎻⎻⎻⎻⎻⎻⎻⎻⎻ HᏤ ⎻⎻⎻⎻⎻⎻⎻⎻⎻⎻⎻⎻⎻⎻

Intelligence thử nghiệm Studies in Vietnam

First, let’s address Lynn’s study for Vietnam. In IQ và Global Inequality (p. 313), he notes: “The IQ of 94 is given by Flynn (1991) for Vietnamese immigrants in the United States.” The citation is khổng lồ James Flynn’s book Asian Americans: Achievement beyond IQ.

I’m not thrilled about the use of immigrant scores for a national IQ, but we can set this issue aside for a larger problem: Flynn’s book doesn’t even give an IQ score for Vietnamese immigrants. In his nhận xét of Asian American IQ studies, Flynn summarizes some obscure data published in a Raven’s Progressive Matrices technical manual: An anonymous scholar collected some RPM data in an anonymous thành phố in West-Central America. Based on regional demographic data, Flynn surmises that those classified as Asian Americans in this study were possibly up khổng lồ 60% mainland Southeast Asian, with many of these being recent refugees from Vietnam, Laos, and Cambodia. It’s quite a stretch to lớn re-classify a diverse American mish mash of Asian ethnic groups as “Vietnamese immigrants.”

Later on I’ll discuss several actual studies of Vietnamese immigrant IQ that Lynn could have used instead.

Most of the studies in Vietnam are newer than IQ and the Wealth of Nations, but there are a few exceptions from the Vietnam War era.

In the oldest study, Susan Mayer (1966 ) used her husband’s local military contacts to help her remotely administer the Draw-a-Man kiểm tra to schoolchildren in South Vietnam. Their village, near Saigon, was 95% Catholic, & was mostly composed of refugees from the Communist North.

Sister Rose, a local teacher who was educated in America, administered the chạy thử according khổng lồ the instructions in the manual. The children, ages 8-12, were all poor peasants with no experience drawing pictures, so they were given a practice round lớn get familiar with the task. Nevertheless this small sample of 47 children had a Draw-a-Man IQ of 98.9, virtually the same as American children.

A second study, conducted by the U.S. Military, compared 82 Vietnamese & 31 U.S. Helicopter mechanics on a battery of nonverbal ability tests (Guthrie et al, 1971 ). Seven different abilities were assessed with 11 sub-tests from French’s Kit of Reference Tests. Performance was similar for the two groups on most tests, but the Vietnamese airmen scored about 1½ standard deviations lower than the Americans on the tool knowledge test. This might’ve been related khổng lồ difficulty interpreting the two-dimensional thử nghiệm drawings. Their comparative IQ was 96.6 (or 92.5, if we use the French’s Kit norms). However, I’m marking this as a mildly unrepresentative sample— the subjects were all high school graduates working in the Vietnamese airforce.

■ The Young Lives study

The literature on Vietnam is then silent for many years until the Young Live project in the 2000s. Young Lives is a large longitudinal study that is collecting cognitive data for some 14,000 children from Ethiopia, India, Peru, & Vietnam. The children will be tested five times over a 14 period, from 2002 lớn 2016, with the fourth round of testing beginning this year.

The first YL report was published in 2003. Raven’s Progressive Matrices were administered khổng lồ a cohort of 1000 8 year olds in each country (Tuan et al, 2003 ). However, the children in Ethiopia và Peru had too many problems with the test, so the scores are not reported, & the demo was discontinued from the study.

The second round of testing occurred in 2006, and a full report of this data wasn’t available until fairly recently. Glewwe et al (2012 ) report raw scores for a translated version of the Peabody Picture Vocabulary Test. The 8 year olds from the first round of testing are now 12 & their IQ on the PPVT is 95.3.

This data is also roughly broken down by ethnicity. The Kinh are the majority ethnic group in Vietnam, comprising some 86% of the population, và their IQ on the PPVT is 98.3.

Some of the larger ethnic groups in Vietnam are Thais, Khmer, Chinese, và Hmong. But the data for minorities are lumped together under just two categories: those who speak Vietnamese, & those who speak minority languages. The PPVT score of the first group was 82.3, và the PPVT score of the second group was 64.3.

A larger cohort of children who were 1 year old during the first round of testing, were also included for round 2 testing. This group of 1,747 5 year olds had a (much lower) PPVT IQ of 82.3.

For this cohort, the tởm majority had an IQ of 84.3. Vietnamese speaking minorities had a score of 75.3, and non-Vietnamese speaking minorities had a score of 65.3.

Data from the third round of YL testing, which occurred in 2009, is spread across three recent reports:

Behrman et al (2013 ) report scores for 1,602 children in the younger cohort, who are now 8 years old. Their latest PPVT IQ is 85.4.

Fink & Rockers (2014 ) report scores for 976 children in the older cohort, who are now 15 years old. Their latest PPVT IQ is 102.4.

Cueto & Leon (2012 ) also discuss psychometric equivalence. It’s noteworthy that there is minimal differential thành tích functioning for the Vietnamese translation of the PPVT: only one sản phẩm was removed for the older cohort, and no items were removed for the younger cohort.

Cueto & Leon also report that PPVT scores in the younger sample have correlations of .28 with father’s education, .29 with mother’s education, và .36 with family wealth.

The proper interpretation of Young Lives will be difficult until round 4 data is released. Looking at just the older cohort we see a score of 95.3 at age 12 và a score of 102.4 at age 15.

Looking at just the younger cohort we see a score of 82.3 at age 5, và a score of 85.4 at age 8.

The large difference between these two closely spaced birth cohorts from the same regions might suggest either 1) a bizarre sudden decline in national IQ, or 2) a bizarre jump in Vietnamese cognitive development that occurs around puberty.

Either way a simple average of the scores feels like an inadequate summary of Vietnam’s IQ. Scores are increasing for both cohorts, so if there is a large jump in the younger cohort’s IQ in round 4, it might make sense to give a greater weight to studies with older children. Until that time, the current mean IQ from the YL project is 91.4.

■ Three more intelligence studies for Vietnam

A fourth study of intelligence in Vietnam is Watanabe et al (2005 ). 311 rural children, age 8, from the Thanh Hoa province, were tested with the Colored Progressive Matrices.

The average IQ of these children was 82.4, which is similar lớn the IQ of children at this same age in the YL sample.

A fifth study of intelligence in Vietnam is Nga et al (2011 ). 469 children, also age 8, from the Hung Yen province, were tested with the Colored Progressive Matrices as well as several performance sub-tests from the Wechsler Intelligence Scale for Children.

IQ on the CPM was 82.6. IQ on the WISC was 82.5.

A sixth study of intelligence in Vietnam is Rindermann et al (2013 ). 60 children, age 11, from two different cities in north & south Vietnam, were given the Cognitive Ability Test.

Rindermann provides raw scores as well as several different kinds of standard score estimates. I choose to lớn calculate an IQ from the test’s German norms and showroom a 16 year Flynn adjustment, giving this sample an IQ of 97.3.

Table I: IQ test scores in Vietnam

1965A8-1247DAM99Mayer, 1966
1969SA20-2282FKRT97Guthrie et al, 1971
2004A8311CPM82Watanabe et al, 2005
2006A51747PPVT82Glewwe et al, 2012
200981602 85Behrman et al, 2013
2006A12945PPVT95Glewwe et al, 2012
200915976 102Fink và Rockers, 2013
2007A8469CPM83Nga et al, 2011
2013A1160CogAT97Rindermann et al, 2013

This leaves us with six IQ studies & seven different samples for Vietnam (Table I). Three different samples of 8 year olds show a remarkable similarity across four tests: PPVT = 85.4 (Glewwe et al, 2012), CPM = 82.4 (Watanabe et al 2005), and CPM = 82.6 & WISC = 82.5 (Nga et al, 2011).

It also seems consistent that Young Lives found an IQ of 95.3 for a sample of 12 year olds and Rindermann et al (2013) showed an IQ of 97.3 for 11 year olds.

This is all suggestive that IQ increases over time for Vietnamese children (“cumulative advantage”), perhaps reaching 100 or higher by later adolescence as seen in the older YL cohort (Fink & Rockers, 2014). More research is needed.

Using the median, the average IQ for Vietnam from 6 normal samples is 91.4.

Achievement Tests in Vietnam

In 2001 the Vietnam Ministry of Education & Training (MoET), in collaboration with various NGOs, administered math & reading tests khổng lồ over 70,000 5th grade students from all across the country.

These tests had a number of items that were similar to or taken directly from TIMSS, one of the major worldwide student achievement tests. The researchers used these common items as a bridge between the two tests in order to lớn evaluate Vietnam’s performance in a global context (World Bank, 2004, pp. 534-543 ). One obstacle lớn a straightforward comparison is that the TIMSS children were in a lower school grade. The Vietnamese 5th graders performed lượt thích the Hong Kong 4th graders at the vị trí cao nhất of the test rankings, but depending on how much these scores increase with age, this could mean anything from a really good lớn a really bad performance. The researchers cautioned against over-interpretation & kept their conclusions vague, but their emphasis on Vietnam’s rank next to TIMSS’ đứng top performers, suggested this was preliminary evidence that the country had relatively talented students.

Vietnam only recently participated in a cross-national study of student achievement with the Programme for International Student Assessment (PISA) 2012. When the results were released in December 2013, Vietnam’s high international ranking was reported with much fanfare.

Table II shows that when their scores are converted into an Achievement Quotient—with the United Kingdom set at 100—Vietnam has a PISA AQ of 102.4 (OECD, 2013 ).

Table II: AQ test scores in Vietnam

2012SA154959PISA102OECD, 2013


On the one hand, the sample was 15 years old và this is consistent with the IQ data that suggests older Vietnamese children perform at the level of Western European children.

On the other hand, it is also suspicious how well these single-party Communist remnants bởi on international achievement rankings. (See my post on Cuba for another example.)

A more identifiable problem is that secondary students in Vietnam are a more elite portion of the population than their counterparts in developed nations: “The World ngân hàng reports that in 2010 the gross enrolment rate at upper-secondary schools in Vietnam was just 65%, compared with 89% & 98% in America and Britain, respectively. South Korea’s rate was 95%.” A related problem is that Vietnam had one of the worst rates of sample attrition among the participating nations.

This is not khổng lồ say that the Vietnam (or China… or even Cuba) achievement rankings are necessarily wrong or need khổng lồ be dismissed. This issue shows one reason why it is important to lớn take a holistic approach to the cognitive literature, despite the obvious psychometric advantages of tests like PISA & TIMSS: intelligence chạy thử results come from many independent sources.

One ‘Big Data’ advantage of these international achievement tests is the large, nation-wide samples, which permit finer “state”-level analyses for many different nations (e.g. Italy, Spain, Germany, Mexico, & Brazil). While I am not aware of PISA releasing such data for Vietnam, the 2001 MoET study did report reading scores for all Vietnamese provinces (World Bank, 2004, phường 572). I’ve fit these scores lớn Vietnam’s PISA AQ score of 102.1, và placed them into two maps below: Figure I shows the AQ cấp độ of all 61 Vietnam provinces, while Figure II shows the 8 major regions of Vietnam, along with their corresponding AQs.


Heiner Rindermann (2013) found a three point advantage for a small sample of children in the đô thị of Pleiku (located in the Central Highlands region in the South) over the children from nhị Phong (located in the Red River Delta region in the North). But the MoET results reveal higher performance in the North than in the South: the average AQ of the North Vietnam provinces is 102.4, while the average AQ of the South Vietnam provinces is 100.3. The highest scores were from the Red River Delta in the North, which includes the nation’s capital, Hanoi. The lowest scores were in the Mekong River Delta in the far south.

This is consistent with a cognitive pattern found within many nations (including the US, Brazil, Japan, Mexico, Italy, & Spain)—and within & between continents—where thử nghiệm scores are higher in the northern regions than in the southern regions. The correlation between MoET performance và latitude for all 61 Vietnam provinces is .33. For comparison, the (intraracial) correlation between NAEP performance and latitude for the 50 U.S. States is .52 (Epigone, 2007). Và the correlation between achievement demo scores and latitude for 47 Japanese prefectures is .44 (Kura, 2013).

The geography of intelligence could point khổng lồ an intensifying selection pressure for cognitive ability at more temperate latitudes, and/or the biological consequences of increasing parasitic insults at lower latitudes. If intellect is a source of martial leverage, this could be relevant to lớn a historical pattern of invasion and conquest running from north khổng lồ south (Hart, 2007).

Intelligence & achievement thử nghiệm scores of the Vietnamese diaspora

■ Vietnamese AmericansThere are 1.7 million Vietnamese Americans, making them the fourth largest Asian American ethnic group. Yet there were hardly any Vietnamese people living in the United States prior to lớn the Fall of Saigon in 1975 (only 650 arrivals between 1950-1974). The first wave of Vietnamese refugees, numbering about 125,000, was largely made up of educated professionals with former roles in the South Vietnam establishment. The U.S. Government aided their escape. A second, larger wave of mostly poor & uneducated immigrants (called “boat people”) began arriving from 1978-1980s.

The first intelligence study for Vietnamese Americans is an early snapshot of this second wave of refugees. Joseph Delatte (1978 ) tested 93 children, ages 5-10, with the Goodenough Draw-a-Man test. The sample had only been in the country for about 6 months, so the instructions were translated into Vietnamese. Their IQ on this thử nghiệm was 101.4. This parallels the performance of the South Vietnamese children tested by Mayer (1966) over a decade earlier.

Another study from this period of high immigration looked at a disadvantaged sample of low SES, non-English speaking Vietnamese preschoolers (Milan, 1983 ). Marjorie Milan randomly selected đôi mươi children with these characteristics from school enrollment records in Denver, Colorado. Prior khổng lồ their entry into kindergarten, Milan tested the children in their homes with the aid of an interpreter. Their IQ on the Columbia Mental Maturity Scale was 99.4.

Vietnamese Americans are less than 1% of the U.S. Population, but small numbers of Vietnamese children can be found in larger datasets. I analyzed the National Longitudinal Study of Adolescent Health (Malloy, 2014a). This is a representative survey of high school students from 1995. Showroom Health contains 19 Vietnamese adolescents, và their IQ on the Peabody Picture Vocabulary test is 83.2.

I also looked at the SWEEP dataset (Study of State-Wide Early Education Programs). This is combined data from two major studies on the effects of pre-k programs in 11 states. This dataset contains 23 Vietnamese preschoolers that were tested on the PPVT in 2003. Their IQ on this thử nghiệm was 85.7 (Malloy, 2014b).

Dick et al (2002 ) looked at Vietnamese Americans on the other over of the lifespan. Seniors from various ethnicities in Southern California were recruited to establish sub-group norms for an experimental kiểm tra battery containing the block design và digit span subtests from the Wechsler Adult Intelligence Scale-Revised. On average, the 61 Vietnamese participants were 71.5 years old and had only been in the country for 3 years. Virtually none of this sample spoke English. They had a WAIS IQ of 99.5.

Urdan & Giancarlo (2001 ) administered the Naglieri Noverbal Ability test to 145 Vietnamese American high school students in California. These students had an IQ of 101.3.

The most recent study for Vietnamese Americans is Pham và Kohnert (2014 ), who tested a group of bilingual 1st graders in Florida. 55% of the sample was U.S. Born, và immigrants had arrived, on average, at age 3. Their IQ on the test of Nonverbal Abilities was 107.7.

This gives us seven different samples for Vietnamese Americans (Table III). Even though the preschool children in the study by Milan (1983) had an average IQ, they were selected for disadvantaged traits, so they are a relatively unfit sample.

Taking the median average of six normal samples gives us an IQ of 100.7 for Vietnamese Americans


Table III: IQ thử nghiệm scores for Vietnamese Americans

1978A5-1093DAM101Delatte, 1978
1982SD5-620CMMS99Milan, 1983
1995A1619PPVT83Malloy, 2014a
2000A16145NNAT101Urdan & Giancarlo, 2001
2003A523PPVT84Malloy, 2014b
2001A7261WAIS100Dick et al, 2002
2008A733TONI108Pham & Kohnert, 2014

Standardized achievement tests—objective measures of learned academic material—provide an alternative, but similar way of revealing intellectual talent & potential.

Some 38% of Vietnamese Americans live in California, which is convenient for our purposes here because California gives state-wide achievement tests to nearly all school children, & this data is broken down by ethnicity and available online: Standardized Testing & Reporting (STAR).

For the years 2003-2006 I looked at the performance of over 240,000 Vietnamese Americans on the reading và math sections of the California Achievement Test. In comparison with whites, Vietnamese students had an AQ of 100.6 (Reading=97.7, Math=103.5).

For the years 2009-2012 I looked at the performance of over 250,000 Vietnamese Americans on the math and reading sections of the California Standards Tests. In comparison with whites, Vietnamese students had an AQ of 103.8 (Reading=101.6, Math=106).

An earlier & much smaller amount of data is also available from the Children of Immigrants Longitudinal Study, which gave the Stanford Achievement thử nghiệm to 372 Vietnamese school children living in San Diego, CA in 1992 (Portes & MacLeod, 1996 ). Their AQ was 99.6 (Reading=95.4, Math=103.8).

The earliest and smallest study by Ima & Rumbaut (1989 ), reports Comprehensive thử nghiệm of Basic Skills scores for 99 Vietnamese students in San Diego. This sample had an AQ of 98.7 (Reading=91.6, Math=106.1).

The median AQ from the four sources of data is 100.6 (R=96.6, M=103.7). This is virtually identical lớn the average from the IQ studies.

The average leaves out part of the story: there has been an upward trend in Vietnamese American achievement kiểm tra performance since the 1980s, và it hasn’t stopped. For example, the most recent year with data on the California Standards Tests—2012—shows an AQ of 104.9.

Table IV: Achievement scores for Vietnamese Americans

1987A12-1899CTBS99Ima và Rumbaut, 1989
1992A14372StAT100Portes & MacLeod, 1996
2003-06A8-17243288CAT101Malloy, 2014c
2009-12A8-17258119CST104Malloy, 2014d

■ Chinese-Vietnamese Americans

Are Chinese people from Vietnam responsible for the high test scores of Vietnamese immigrants? Richard Lynn has suggested this numerous times. For example:

a) When addressing how Southeast Asians outperformed whites in the National Educational Longitudinal Study, he states that its “probably because many of are ethnic Chinese-Vietnamese” (Lynn, 2008, phường 272).

b) He uses the over-representation of Vietnamese Australians in higher education as evidence for ‘East Asian’ ability by asserting that they are “mainly ethnic Chinese” (Lynn, 2008, pp. 51-52).

c) In his discussion of the Clark & Hanisee (1982) transracial adoption study—which showed a high IQ for a sample that was about half Vietnamese—Lynn simply asserts that the babies were “largely Chinese” (Lynn, 2006, p.139). This is not stated in the paper. He is (I assume) extrapolating from the fact that the adoptees came from the first wave of refugees in 1975. <1>

Lynn is relying on innuendo & inaccuracy, but this is a legitimate issue: there is both psychometric và sociological evidence that Chinese populations in Southeast Asia have high intelligence. Amy Chua describes their status in Vietnam at the beginning of the war: “The magnitude of the Chinese minority’s economic nguồn was astounding. Constituting just 1 percent of Vietnam’s population, the Chinese controlled an estimated 90 percent of non-European private capital in the mid-1950s and dominated Vietnam’s retail trade, its financial, manufacturing, và transportation sectors, & all aspects of the country’s rice economy” (Chua, 2003, p. 33-34).

It is also true that a significant fraction of the Vietnamese diaspora was ethnic Chinese, but this doesn’t permit intellectual laziness. For example, there were 18,000 Chinese in the initial 1975 wave of refugees out of Vietnam, which was only about 14% of the total (Trieu, 2013, p 306). The first wave of Vietnamese immigrants was not “largely Chinese” or even close.

It was actually the second wave out of Vietnam that marked the most intense period of Chinese immigration: Approximately 40% of the Vietnamese boat people arriving in the late 70s-early 80s were Chinese minority (Caplan et al, 1991, p 45). However, Chinese-Vietnamese immigration also slowed rapidly: about 40% of all Chinese-Vietnamese in the U.S. Today arrived between 1979-1981 (Rumbaut, 2007, phường 659). Và yet the total Vietnamese population has nearly tripled since 1990; Chinese-Vietnamese are an ever-shrinking part of the Vietnamese American population.

Currently, there are about 200,000 Chinese-Vietnamese in the U.S. Out of 1,737,433 Vietnamese Americans, or about 11.5% of the total. (Trieu, 2013, p. 306).

This small fraction can’t tài khoản for very much of our estimates. If we assume Chinese-Vietnamese have an IQ of 106, this still implies that majority Vietnamese Americans have an IQ of 100.

Further, Vietnamese American AQ scores have crept upwards as the population has expanded since the 1990s, coinciding with a period when Chinese-Vietnamese were an ever declining fraction of that population.

Finally, there is no evidence that Chinese-Vietnamese even have higher ability than the gớm population, & U.S. Immigrant data suggests either no difference or higher ability for majority Vietnamese. An apples-to-apples study of 536 second-wave refugees actually found better school performance for the Vietnamese majority than for the Chinese minority (Caplan et al, 1991, pp.16-17). The refugee children had an overall AQ of 101.5 on the California Achievement Test, & there were no differences between the Lao, Chinese-Vietnamese, and Kinh ethnic groups (according to lớn the authors anyway … the ethnic scores are not reported).

Ima & Rambaut (1989) also compare the performance of Chinese-Vietnamese & majority Vietnamese in their sample. On the Comprehensive kiểm tra of Basic Skills the majority Vietnamese had a slightly higher AQ (99.5, N=54) than the Chinese-Vietnamese (97.8, N=45).

■ Vietnamese Australians

More than 200,000 people of Vietnamese descent live in Australia, và there is a small amount of cognitive data available for this population.

Dandy và Nettelbeck (2002 ) administered the Standard Progressive Matrices to a lower SES group of 56 Vietnamese children in grades 6 & 7. A matched sample of lower SES whites, và a higher SES sample of Chinese Australians were included as comparison groups. SPM scores are not reported, but there was no difference between the Vietnamese & white Australians (according to the authors anyway … I hate it when numbers are not reported).

This does not imply an IQ of 100 (cf. Lynn, 2008, pp. 50-51); the trắng comparison group was selected on the basis of low SES, and it is likely that their scores would be below the “Greenwich Standard” UK chạy thử norms.

Another study provides Advanced Progressive Matrices scores for some students và recent graduates of the University of New South Wales (Nguyen-Hoan, 2008 ). 38 bilingual Vietnamese were compared with 55 monolingual English-speaking students. The IQ of the Vietnamese students was 110.8 và the IQ of the native students was 111.6. Vietnamese students were selected for strict English-Vietnamese bilingualism, so no one in this sample was from a Chinese-speaking family.

Table V: IQ kiểm tra scores for Vietnamese Australians

2007MA2038APM111 Nguyen-Hoan, 2008


Levels et al (2006 ) provide immigrant scores from PISA 2003 for ethnic groups all over the world. The Achievement Quotient for 126 Vietnamese Australians was 109.2.

According to lớn the 2001 census, 40.3% of Australians that were born in Vietnam are ethnic Chinese (Ember và Skoggard, 2005, p. 1147). It would be good to know if the Chinese-Vietnamese in nước australia have different abilities than majority Vietnamese, but the lack of a difference in America makes this concern seem a lot less relevant.

The study by Dandy và Nettelbeck (2002) might suggest a somewhat below average IQ for Vietnamese Australians because they scored lượt thích a disadvantaged group of whites. But Nguyen-Hoan (2008) finds no real gap for an elite sample, which perhaps implies no gap at all. Neither one of these studies is ideal.

PISA is the best sample & indicates a very high level of achievement, if not intelligence.

Table VI: Achievement scores for Vietnamese Australians

2003A15126PISA109Levels et al, 2006


The intelligence of transracially adopted Vietnamese

There is a modest but growing literature showing that Koreans adopted by trắng families in Europe & North America develop higher IQ & academic ability than trắng adoptees or the general population. These studies suggest that the high cognitive scores generated by South Korea và Korean immigrants khổng lồ the West are not due lớn cultural transmission, but are the result of hereditary differences.

Some data for Chinese adoptees has entered the literature and suggests a similar pattern.

More commonly, researchers vì not look for or report differences across ethnic, regional, or racial groups when they publish psychological data for samples of intercountry adoptees. Adoptees from many different regions are often lumped together, even when the sample sizes can comfortably accommodate disaggregation.

Transracial adoption studies could địa chỉ cửa hàng some real insight into the mystery of Southeast Asian intellectual potential.

The abstract of one small study, which I mentioned above, promises data for “25… subjects … adopted from Southeast Asia” (Clark và Hanisee, 1982 ). Annoyingly, the authors consider Korea a part of Southeast Asia: the sample consists of 12 children from Vietnam, 8 from Korea, 3 from Cambodia, and 2 from Thailand. So the sample is about 68% Southeast Asian & 48% Vietnamese.

These children had an IQ of 114.9, suggesting no deficit for the Southeast Asians. Richard Lynn simply re-classifies the Vietnamese as Chinese by fiat and uses the study as evidence that ‘East Asians’—instead of ‘Southeast Asians’—have genetically high IQ (Lynn, 2006, pp. 139-140). His section on Southeast Asians only presents evidence for genetically lower IQs.

I have located another transracial adoption study that has been completely overlooked by hereditarian researchers, perhaps due to the bias I just illustrated.

McBogg & Wouri (1979 ) report data for 36 Vietnamese children adopted into trắng American homes. 100% of the children had histories of malnutrition, disease, và deprivation prior to lớn adoption. The average age of the children at assessment was about 4 years old, & they had been placed in their trang chủ at an average age of 2. 70% were placed before their first birthday.

The adoptees were all evaluated with the Slosson Intelligence Test và their average IQ was 110.9!

An overlooked issue with the Vietnamese adoption samples from both of the studies reviewed above is not that they are Chinese, but that their origin in the 1975 wave of refugees does suggest that they could be from more elite families. That means an advantaged genetic background compared with the average Vietnamese. Assuming that Vietnam’s IQ is 91.4, this implies that the average IQ of the biological parents of McBogg & Wouri’s sample was 114. This is not an implausibly high IQ for VIPs in the South Vietnamese establishment.

On the other hand, the first wave of refugees was far from uniformly elite, và the origin of the adoptees is reported as a complete unknown: they came khổng lồ America as sick & starved foundlings. There is no real reason lớn believe these were the abandoned or orphaned children of generals và politicians, although this possibility also can’t be dismissed.

Table VII: IQ scores of transracially adopted Vietnamese

1978MD1-1136Slosson111McBogg & Wouri, 1979



■ The average IQ of Vietnam from six normal samples is 91.4. But there is some evidence that IQ in Vietnam increases lớn about 100 during adolescence.

■ Recent PISA results indicate that Vietnam has an Achievement Quotient of 102. Although some skepticism over this result seems warranted.

■ There is a .33 correlation between latitude và test scores in Vietnam: the Northern part of the country has slightly higher scores than the Southern part.

■ The average IQ for Vietnamese Americans from six normal samples is 100.7.

■ The average AQ for Vietnamese Americans from four normal samples is 100.6.

■ The achievement kiểm tra performance of Vietnamese Americans has increased over time since the 1980s, và this trend is ongoing.

■ Chinese-Vietnamese Americans do not have higher chạy thử scores than majority Vietnamese; their presence in the U.S. Does not tài khoản for the high performance of Vietnamese Americans.

■ Vietnamese Australians excelled at PISA, but two studies offer a murky picture of IQ: it appears khổng lồ be average khổng lồ somewhat below average.

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■ One sample of transracially adopted Vietnamese children suggests a high level of intellectual potential for this population. Another partial sample of Vietnamese adoptees suggests the same. Both samples came khổng lồ America on a wave of elite immigration, which could imply that they were from above average backgrounds. The origin of these infants is unknown, but their sorry condition upon arrival did not denote privilege.