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Table 1 Characteristics of pregnant women depending on never and ever drink tea (≥3 times/week) (n = 10 179), Urban China, 2010–2012

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

Characteristics Never (n = 9303) Ever (n = 876) P value
n % n %
Age, years      <0.0001
  < 26 2104 22.62 198 22.6  
 26–28 2915 31.33 232 26.48  
 28–31 2332 25.07 206 23.52  
  > 31 1952 20.98 240 27.40  
Education, years      0.0034
  ≤ 9 2004 21.54 234 26.71  
 10–15 3650 39.23 327 37.33  
  ≥ 16 3475 37.35 304 34.70  
 Missing 174   11   
Employment during pregnancy      0.36
 Yes 4812 51.73 439 50.11  
 No 4491 48.27 437 49.89  
Monthly income (¥)      0.0003
  ≤ 2000 2190 23.54 231 26.37  
 2000–4000 4365 46.92 349 39.84  
  > 4000 1858 19.97 213 24.32  
 Missing      
Parity      <0.0001
 Nulliparous 6773 72.80 576 65.75  
 Parous 2530 27.20 300 34.25  
Pregnancy hypertension disease      0.026
 No 8838 95.00 817 93.26  
 Yes 465 5.00 59 6.74  
Prepregnancy BMI      0.34
  < 18.5 1863 20.03 163 18.61  
 18.5–23.9 6146 66.06 573 65.41  
  ≥ 24 978 10.51 107 12.21  
 Missing 316   33   
Alcohol drinking during pregnancy      <0.0001
 No 9116 97.99 835 95.32  
 Yes 49 0.53 29 3.31  
 Missing 138   12   
Active smoke during pregnancy      0.0002
 No 9235 99.27 859 98.06  
 Yes 68 0.73 17 1.94  
Passive smoke during pregnancy      
 No 7623 81.94 614 70.09 <0.0001
 Yes 1680 18.06 262 29.91  
Sex of the child      0.51
 Boy 4911 52.79 447 51.03  
 Girl 4361 46.88 427 48.74  
 Missing 31   2   
  1. Abbreviation: BMI body mass index