Table 1.

Association between foetal age and seasonal foetal sex ratio (male proportion)

Foetal age (mth)	Dry seasons			Wet seasons			Pexact-value dry vs. wet
	Mean	95% CI	n	Mean	95% CI	n
2-12	0.472	0.438-0.505	844	0.517	0.496-0.539	2109	0.025
2-4	0.439	0.389-0.492	335	0.514	0.470-0.557	504	0.035
5-12	0.493	0.450-0.536	509	0.518	0.494-0.543	1605	0.33