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Cannon et al¹ analyzed the predictive power of school performance (in the 1950s) in Finland in terms of later schizophrenia. Schoolchildren who were diagnosed as having schizophrenia in adulthood performed worse at ages 7 to 11 years in the nonacademic domain, mainly in sports and handicrafts. In the Northern Finland 1966 Birth Cohort² at school in 1970s, we found that being in a lower-than-age-appropriate grade predicted schizophrenia (odds ratio, 2.5; 95% confidence interval, 1.2-5.1), but school marks, even in the nonacademic domain, did not.³

In a detailed reanalysis, we found somewhat different results from those of Cannon et al. The mean mark in sports among preschizophrenic children was 7.8 and among controls (having no psychiatric hospital care until 28 years of age), 7.9. In Finland, marks given for each subject range from 4 (fail) to 10 (excellent). In handicrafts, the means were 7. 9 and 8.0, respectively. In analysis of . . . [Full Text of this Article]