Table 2 Linear regression analysis of the effect of pre-pregnancy BMI on weight gain.

From: Sex-specific mediating effect of gestational weight gain between pre-pregnancy body mass index and gestational diabetes mellitus

Group

n

β

95% CI of β

SE

t

P value

  

Model 1

    

All BMI

67,777

−0.239

−0.246 to −0.233

0.004

−68.010

<0.001

BMI category (kg/m2)

 <18.5

7055

−0.186

−0.272 to −0.099

0.044

−4.202

<0.001

 18.5–24.9

45,880

−0.168

−0.185 to −0.151

0.009

−19.049

<0.001

 25.0–29.9

11,894

−0.353

−0.401 to −0.305

0.025

−14.346

<0.001

 ≥30.0

2948

−0.217

−0.278 to −0.155

0.031

−6.924

<0.001

  

Model 2

    

All BMI

67,777

−0.232

−0.239 to −0.225

0.004

−64.554

<0.001

BMI category (kg/m2)

 <18.5

7055

−0.182

−0.269 to −0.095

0.044

−4.102

<0.001

 18.5–24.9

45,880

−0.160

−0.177 to −0.142

0.009

−17.947

<0.001

 25.0–29.9

11,894

−0.344

−0.392 to −0.296

0.025

−14.001

<0.001

 ≥30.0

2948

−0.208

−0.270 to −0.146

0.031

−6.623

<0.001

  1. BMI body mass index, CI confidence interval, SE standard error.
  2. Model 1: Univariate regression analysis, with gestational weight gain as the dependent variable.
  3. Model 2: Multivariable regression analysis, adjusting for maternal age, parity, education level, active smoking, and family history of diabetes.
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