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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