Bågedahl-Strindlund M, Jansson B
Acta Psychiatr Scand. 1983 Mar;67(3):159-62. doi: 10.1111/j.1600-0447.1983.tb00337.x.
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.
该研究基于两组产后精神疾病患者，一组由1952 - 1956年在哥德堡的71名女性组成，另一组由1976 - 1977年在斯德哥尔摩的68名女性组成。将这两个城市在相关时期内的总出生数用作参考。采用卡方检验策略和爱德华兹季节性标准对结果进行统计分析。可以观察到受孕月份存在年度双周期趋势。
