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Table 5 Associations between tea drinking and preterm birth by mother age (n = 10 179) and gestational weight gain (n = 9752), Urban China, 2010–2012

From: Maternal tea consumption and the risk of preterm delivery in urban China: a birth cohort study

Characteristics

Never

Ever

Term (n)

Preterm

Term (n)

Preterm

No.

OR(95 % CI)

No.

OR(95 % CI)

Maternal age

      

  < 30

5078

512

1

806

93

1.04(0.81–1.34)

  ≥ 30

2754

327

1.33(1.05–1.68)

522

87

1.87(1.36–2.59)

Interaction p value

    

0.0208

Gestational weight gain

      

 Normal or less normal

3180

507

1

319

58

1.04(0.76–1.43)

 Overnormal

4896

311

0.99(0.78–1.26)

405

50

1.87(1.28–2.73)

Interaction p value

    

0.0371

  1. Adjusted for maternal age, educational level, employ status, monthly family income, parity, hypertensive disorder complicating pregnancy, prepregnancy BMI, alcohol drinking and smoking (active smoking and passive smoking) during pregnancy and history of preterm (additionally, GWG was adjusted for gestational weight gain as a continuous variable)
  2. Abbreviations: BMI body mass index, GWG gestational weight gain
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BMC Public Health

ISSN: 1471-2458

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