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Sex Differences in Adult Intelligence in Sweden

Guy Madison

Published: 2016/09/01


Studies reporting sex differences in intelligence among the Swedish adult population were systematically reviewed. Five studies from 1959 to 2008 fulfilled the inclusion criteria, and were supplemented with three studies from 1988 to 2015 using non-representative but large samples. The analyses comprise 37 subtest effects that yielded a total of 57 effects. Males tend to exhibit higher performance on spatial and non-verbal reasoning tests, corresponding to ~0.15-0.25 standard deviations, and lower performance on memory tests (only one study). There were mostly non-significant trends for verbal test results. Key Words: Sweden, Cognitive abilities, Intelligence, Sex differences

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