Symonds R L, Williams P
Br J Psychiatry. 1976 Jul;129:45-8. doi: 10.1192/bjp.129.1.45.
The seasonal variation of admissions to hospital with a diagnosis of mania (296.1) in England and Wales was examined. The results indicated that for females there was a significant seasonal trend, the peak being in August-September, while for males there was no significant seasonal pattern. The possible reasons for these findings are discussed.
对英格兰和威尔士诊断为躁狂症（296.1）的住院病例的季节性变化进行了研究。结果表明，女性存在显著的季节性趋势，高峰期在8月至9月，而男性则没有显著的季节性模式。讨论了这些发现的可能原因。
