Academic journal article Mankind Quarterly

Sex Differences in the Intelligence of University Students in Thailand

Academic journal article Mankind Quarterly

Sex Differences in the Intelligence of University Students in Thailand

Article excerpt

A meta-analysis of 22 studies of sex differences in the intelligence of university students on the Standard and Advanced Progressive Matrices was reported by Irwing and Lynn (2005) and found that men obtained a higher score than women by 4.6 IQ points. The study also reported that in the 18 studies for which standard deviations were available women showed greater variability than men in 8, while men showed greater variability in 10.

We report here a study of sex differences in the intelligence of university students in Thailand tested with the Advanced Progressive Matrices. The study was carried out by Chalitta Kyiyanan (1995) and presented in a master's thesis written in the Thai language. The sample consisted of 480 men and 480 women. The men obtained a mean score of 23.78 (SD 4.53), and the women obtained a mean score of 23.42 (SD 4.67). This is a difference of .08d equivalent to 1.2 IQ points and is not statistically significant. Nevertheless, the higher average score obtained by men is consistent with the results of the meta-analysis of 22 studies of sex differences in the intelligence of university students on the Standard and Advanced Progressive Matrices reported by Irwing and Lynn (2005). Differences in university enrollment could make some contribution to the difference. According to the Barro-Lee dataset (www.barrolee.com), 7.8% of males and 8.5% of females aged 25-29 in Thailand had at least some tertiary education in 1995. For 2000, the corresponding numbers are 8.4% and 10.7%. Thus males in university were slightly more selected than females and are therefore expected to score marginally higher on cognitive tests.

The women showed slightly greater variability than men with a standard deviation of 4.67 compared with 4.53 for men. Taking this result together with those of the 18 previous studies suggests that there is no difference in variability between men and women students on the Progressive Matrices contrary to the more frequent reports that men have greater variability than women (Arden & Plomin, 2006).

The combined sample obtained a score of 23.59 (SD 4.60). This is at the 58th percentile of the British 1992 norms given by Raven, Raven and Court (1998, Table APM 14) and equivalent to a British IQ of 103. British university students obtained a score of 26.8 on the test (Raven, Raven & Court, 1998, Table APM 32), equivalent to a British IQ of 109. …

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