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
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