Table 2.

Difference between the two subgroups according to temperature threshold (the daily mean temperature threshold was 17.2 °C, the daily minimum temperature threshold was 14.4 °C, and the daily maximum temperature threshold was 21.6 °C)

Mean temperature (days)	Preeclampsia admissions per day (95% confidence interval)	Minimum temperature (days)	Preeclampsia admissions per day(95% confidence interval)	Maximum temperature (days)	Preeclampsia admissions per day(95% confidence interval)
>  = 17.2 (365)	1.48 (1.34–1.63)	>  = 14.4 (364)	1.50 (1.36–1.64)	>  = 21.6(365)	1.50 (1.36–1.64)
< 17.2(366)	1.82 (1.66–1.99)	< 14.4(367)	1.82 (1.65–1.98)	< 21.6(366)	1.82 (1.66–1.99)
t	-3.11	t	-2.87	t	-2.96
p	0.002	p	0.004	p	0.003