Schizophrenia and season of birth: further southern hemisphere studies.

Studies in the northern hemisphere and an equatorial region have suggested that schizophrenics have a greater likelihood of being born in the coldest three months of the year. Two further southern hemisphere studies, performed in New Zealand and Tasmania, are reported in this paper. Results from these and other studies suggest that support for a link between schizophrenia and winter birth in the southern hemisphere is slight and inconsistent.