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Relation between birth order and IQ score. Mean IQ scores for male conscripts, first, second and third born to Norwegian mothers with single births only and first birth between 1967 and 1976, according to birth order and number of elder siblings who died in infancy (age < 1 year). Scores are adjusted for parental education level, maternal age at birth, sibling size, birth weight and year of conscription. Error bars show 95% confidence intervals. Source: Explaining the Relation Between Birth Order and Intelligence Petter Kristensen1, and Tor Bjerkedal Science 22 June 2007: Vol. 316. no. 5832, p. 1717 DOI: 10.1126/science.1141493 http://tinyurl.com/2eohmr
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| Date/Time | Thumbnail | Dimensions | User | Comment | |
|---|---|---|---|---|---|
| current | 19:28, 30 June 2007 | | 440 × 346 (18 KB) | Gavinj (talk | contribs) | Relation between birth order and IQ score. Mean IQ scores for male conscripts, first, second and third born to Norwegian mothers with single births only and first birth between 1967 and 1976, according to birth order and number of elder siblings who died |
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