A Systematic Review and Meta-analysis of Northern Hemisphere Season of Birth Studies in Schizophrenia
Glenn Davies, Joy Welham, David Chant, E. Fuller Torrey, John McGrath. Schizophrenia Bulletin 29(3), 2003, 587-593.
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- Tier B At least one element of the record is unverified, named below. Entries may not cite this; the build fails if one does.
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What is not verified
Named. The rest of the record has been checked; these are the elements that have not, and they are why this work is tier B.
- The pooled effect size. A figure of roughly 1.07 is reported in secondary summaries and has not been confirmed against the paper's own tables.
Listed so that a reader is not left with the impression that season of birth and health is an unexamined question, and held as furtherReading only. **This site does not make medical claims**, and this literature is contested on its own terms rather than merely unverified here: a companion Southern Hemisphere meta-analysis reported no significant association, and a long-running critique argues the Northern Hemisphere finding may be an age-incidence artefact. The contrast with the relative age effect is the reason it is listed. There the mechanism is known, jurisdiction-dependent and demonstrable; here it is not.
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