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Table 4 Regression coefficients for association between birth weight 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

−4.076

0.347

−0.693

0.802

−6.761

0.192

−3.012

0.388

12

6.357

0.197

5.915

0.090

5.190

0.324

8.878

0.020

17

8.626

0.024

2.501

0.358

7.279

0.053

3.844

0.148

19

5.466

0.127

2.119

0.393

6.971

0.067

4.345

0.101

24

2.414

0.450

−0.904

0.665

9.649

0.078

−0.772

0.835

28

1.344

0.675

−1.755

0.381

7.352

0.173

−5.336

0.115

30

3.224

0.311

−2.228

0.257

8.083

0.072

−4.482

0.111

Before birth

 6

6.484

0.053

−3.556

0.082

7.263

0.041

−5.047

0.024

 4

8.100

0.025

−2.021

0.353

7.916

0.026

−1.380

0.533

 2

8.891

0.022

0.334

0.889

9.270

0.014

1.003

0.675

At birth

7.219

0.075

1.659

0.507

7.455

0.061

2.614

0.291

  1. *Adjusted for gestational week at birth and season at birth
  2. **Adjusted for gestation week at birth, season at birth, sex of newborn, education level, parity, and precipitation