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- W2112808068 abstract "confirmed or redefined by ultrasound in 95.8% of cases. The sex ratio of 199 454 pregnancies which had occurred in the Modena County between 1936‐1998 was also stratified according to the month of birth. RESULTS: Sex ratio of institutional deliveries was 0.511 and was identical to that obtained from the County registry. Sex ratio at birth did not show a significant seasonal variation. By contrast, sex ratio calculated at time of conception showed a seasonal rhythm, with amplitude of 2.4% and peak values in October (confidence interval: 643 days). The rhythm was in phase with the rhythm of conception that showed peak values in September (confidence interval: 637 days) and an amplitude of 7%. CONCLUSIONS: The superimposition of the phase of sex ratio and conception rhythms supports the contention that more males than females are conceived in seasons with more favourable reproductive conditions." @default.
- W2112808068 created "2016-06-24" @default.
- W2112808068 creator A5008032758 @default.
- W2112808068 date "2003-11-01" @default.
- W2112808068 modified "2023-09-23" @default.
- W2112808068 title "The male disadvantage and the seasonal rhythm of sex ratio at the time of conception" @default.
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- W2112808068 doi "https://doi.org/10.1093/humrep/deg453" @default.
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