Table 5 Final models of multiple linear regression analyses

Influencing Factor

Parameter Estimate

95% Confidence Interval

p

r² final model

Intercept

− 956.9

− 1640 - -273.7

0.0062

0.146

Gender[male = 0, female = 1]

51.46

15.55–87.38

0.0051

Gestational age [weeks]

25.94

8.970–42.91

0.0029

Parity[n]

34.76

9.461–60.07

0.0073

Pre-pregnancy BMI[kg/m²]

8.189

4.162–12.22

< 0.0001

Smoking[no = 0, yes = 1]

−99.49

− 185.3 - -13.71

0.0232

Intercept

− 2084

− 3438 - -730

0.027

0.260

Gender[male = 0, female = 1]

− 175

− 248.5 - -101.4

< 0.0001

Gestational age [weeks]

130

96.4 to 164

< 0.0001

Gestational weight gain category[0 = normal or excessive vs. 1 = insufficient]

− 105

− 195.5 - -14.35

0.0233

Intercept

4.018

1.423–6.612

0.0025

0.122

Gender[male = 0, female = 1]

1.778

0.8609–2.695

0.0002

Parity[n]

0.6411

0.0066–1.276

0.0477

Pre-pregnancy BMI[kg/m²]

0.1973

0.0945–0.300

0.0002

Smoking[no = 0, yes = 1]

−2.344

−4.536 - -0.1512

0.0363