Table 2 Univariate logistic regression analysis of variables in the cohorts

No IAP

Reference

Reference

GBS-IAP

6.719

4.730–9.544

 < 0.001

0.555

0.276–1.117

0.099

Mothers age

1.018

0.982–1.056

0.322

0.997

0.962–1.034

0.873

Mothers without allergic history

Reference

Reference

Mothers with allergic history

2.357

1.575–3.527

 < 0.001

1.721

1.061–2.792

0.028

One child

Reference

Reference

Second child and more

1.509

1.134–2.007

0.005

0.906

0.658–1.246

0.543

Gestational age

0.696

0.607–0.798

 < 0.001

1.135

0.965–1.335

0.127

BMI

0.976

0.894–1.065

0.584

0.964

0.881–1.054

0.421

Weight of birth

1.238

0.87–1.762

0.236

1.159

0.816–1.646

0.411

Breast feeding

Reference

Reference

Artificial feeding

0.386

0.051–2.929

0.357

2.283

0.899–5.795

0.082

Mixed feeding

1.479

1.061–2.061

0.021

1.207

0.832–1.753

0.321

No antibiotics used within 72 h

Reference

Antibiotics used within 72 h

2.544

1.793–3.609

 < 0.01

0.741

0.417–1.318

0.308

No smoking

Reference

Reference

Smoking

1.420

0.933–2.161

0.102

1.012

0.593–1.728

0.966

No keeping pets

Reference

Reference

Keeping pets

1.140

0.849–1.532

0.384

1.329

0.950–1.859

0.097