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Table 4 Associations between types of tea consumption and risk of preterm birth (n = 10 179), Urban China, 2010–2012

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

Drink tea Term (n) Preterm (n = 1019)
No. OR(95 % CI)
Never 8403   
 Types of tea    
  Green tea 502 74 1.42(1.08–1.85)
  Black tea 119 17 1.11(0.64–1.91)
  Scented tea 140 28 1.61(1.04–2.50)
  Before pregnancy
   Green tea 449 67 1.46(1.11–1.93)
   Black tea 99 15 1.21(0.68–2.17)
   Scented tea 114 24 1.77(1.10–2.84)
  During pregnancy  
   Green tea 225 38 1.42(0.98–2.05)
   Black tea 54 9 1.01(0.47–2.18)
   Scented tea 70 15 1.47(0.81–2.65)
  Before pregnancy only
   Green tea 257 33 1.41(0.96–2.07)
   Black tea 58 8 1.44(0.67–3.13)
   Scented tea 62 12 1.87(0.96–3.64)
  Before and during pregnancy
   Green tea 172 31 1.53(1.01–2.30)
   Black tea 34 7 1.21(0.50–2.91)
   Scented tea 44 11 1.71(0.85–3.45)