Temperature during pregnancy influences the fetal growth and birth size

Table 3 Regression coefficients for the association between birth weight and temperature at different gestational points (n = 3267)

Week	Univariate		Multivariate 1*		Multivariate 2**		Multivariate 3***
Week	β	P value	β	P value	β	P value	β	P value
8	−1.176	0.537	−5.273	0.072	−4.101	0.141	−3.824	0.180
12	1.324	0.504	6.864	0.033	5.334	0.081	5.970	0.052
19	0.545	0.786	5.113	0.023	4.226	0.048	4.733	0.028
24	−2.804	0.151	3.155	0.308	2.364	0.421	1.849	0.541
28	−3.82	0.049	−0.688	0.809	−0.803	0.766	−1.431	0.613
30	−4.156	0.028	−0.596	0.801	−0.343	0.878	−0.973	0.679
Before birth
6	−4.236	0.022	−1.279	0.495	−1.045	0.557	−1.772	0.342
4	−2.326	0.205	0.402	0.830	0.398	0.823	0.530	0.775
2	−0.102	0.956	2.845	0.160	2.264	0.239	3.080	0.123
At birth	0.595	0.747	4.027	0.61	3.229	0.113	3.567	0.860

*Adjusted for gestational week at birth and season
**Adjusted for sex of infant, BMI, mother’s education, parity, season at birth, and gestational week at birth
**Adjusted for precipitation, sex of infant, BMI, mother’s education, parity, season at birth, and gestational week at birth

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