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Table 6 Regression coefficients for association between birth length and temperature with stratification of mother’s BMI with adjustments (n = 3267)

From: Temperature during pregnancy influences the fetal growth and birth size

Week Multivariate 1** Multivariate 2**
BMI <18.5 BMI ≥18.5 BMI <18.5 BMI ≥18.5
β P value β P value β P value β P value
8 −0.042 0.062 −0.025 0.080 −0.060 0.027 −0.038 0.033
12 −0.006 0.814 0.001 0.937 −0.002 0.948 0.011 0.565
17 0.011 0.570 0.002 0.892 0.014 0.482 0.002 0.868
19 0.014 0.456 0.001 0.968 0.023 0.253 −0.002 0.903
24 0.011 0.495 −0.002 0.873 0.047 0.096 −0.030 0.116
28 0.015 0.366 0.004 0.713 0.049 0.079 −0.015 0.396
30 0.020 0.228 0.007 0.462 0.037 0.112 0.001 0.960
Before birth
 6 0.047 0.008 0.007 0.486 0.054 0.003 −0.003 0.793
 4 0.064 0.001 0.022 0.054 0.055 0.003 0.018 0.109
 2 0.067 0.001 0.036 0.004 0.059 0.003 0.036 0.004
At birth 0.062 0.003 0.046 <0.001 0.057 0.005 0.050 <0.001
  1. *Adjusted for gestational week and season at birth
  2. **Adjusted for gestation week at birth, season at birth, sex of newborn, education level, parity, and precipitation