We read with great interest the article by Isohanni et al (Reference Isohanni, Lauronen and Moilanen2005), which investigated subtle motor, emotional, cognitive and behavioural abnormalities as predictors of schizophrenia. The authors concluded that these are not useful predictors of illness. However, Isohanni et al did not investigate gestational age as a predictor of psychological abnormalities in later life. This has recently been used as a predictor in some cohort studies (Reference Thompson, Syddall and RodinThompson et al, 2001; Reference Gale and MartynGale & Martyn, 2004; Reference Wiles, Peters and LeonWiles et al, 2005), and is obstetrically one of the most important predictors of childhood outcomes that are also related to psychological abnormalities in later life (Reference Thompson, Syddall and RodinThompson, 2001; Reference Gale and MartynGale & Martyn, 2004; Reference Cunningham, Leveno and BloomCunningham et al, 2005). We feel strongly that birth cohort studies of psychological abnormalities in later life should include gestational week at birth. The study of Isohanni et al would have benefited from inclusion of this variable.
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