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Seasonality of live birth sex ratio in south western Siberia, Russia, 1959–2001
  1. V N Melnikov1,
  2. V Grech2
  1. 1Novosibirsk State University, Novosibirsk, Russia
  2. 2Paediatric Department, St Luke’s Hospital, Malta
  1. Correspondence to:
 Dr V N Melnikov, Novosibirsk State University, PO Box 175, Novosibirsk 630060, Russia; 
 mevlanic{at}.nsk.ru

https://doi.org/10.1136/jech.57.6.471

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    Seasonality of sex ratio of live births (SR: male births divided by total births) has been reported in Europe, North America, Brazil, and Australia. However, no uniform pattern is seen.1 Moreover, the magnitude of any observed seasonal variation varies from population to population with marked variation in Japan2 to minor variation in Germany3 to none in south western Finland, Scotland, Costa Rica, and Hausa, Africa. The population of Novosibirsk region was 2 767 938 in 1988. Siberian climate exhibits considerable seasonal temperature changes. In Novosibirsk over the period 1951–1980, the average difference in mean monthly air temperature …

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