The study is based on two series of patients with post partum mental illness, one consisting of 71 women in Gothenburg 1952-56 and another of 68 women in Stockholm 1976-77. The total number of births in the two cities during the periods in question were used as reference. A strategy of chi-squared test and the Edwards' criteria of seasonality was applied for statistical analyses of the results. A yearly double periodic trend in month of conception could be observed.
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| http://dx.doi.org/10.1111/j.1600-0447.1983.tb00337.x | DOI Listing |
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