The effects of daily meteorological perturbation on pregnancy outcome: follow-up of a cohort of young women undergoing IVF treatment.

Compared to that in winter, the odds of becoming pregnant were higher during higher temperature seasons, summer and autumn (aOR 1.47, 95%CI 0.97–2.23, P = 0.07 (marginally significant) and aOR 1.73, 95%CI 1.12–2.68, P = 0.02, respectively).

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Figure 2 b shows the relationship between probability of pregnancy and ER month; more pregnancy events can be observed in July to September, and the smooth curve also shows a fast increasing trend followed by a decreasing trend, which is consistent with the aforementioned monthly temperature trend.

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