Skip to main content

Table 2 Birth weight results for daily bottled, cold tap, total tap, and total water intake

From: The relationship between water intake and foetal growth and preterm delivery in a prospective cohort study

     Follow-up data Average of baseline
and follow-up data
   Unadjusted Adjusteda Adjusteda
Exposure n (%) ß 95% CI ß 95% CI ß 95% CI
Bottled water
   None 448 (25%) Ref   Ref   Ref  
   Any 1329 (75%) 12 (-38, 63) 31 (-20, 82) 43 (-27, 113)
Cold tap water (ounces)b
   0-27 424 (24%) Ref   Ref   Ref  
   > 27-53 455 (25%) 12 (-50, 74) 9 (-53, 72) 25 (-38, 88)
   > 53-91 444 (25%) 74 (11, 136) 52 (-11, 116) 44 (-19, 107)
   > 91 453 (26%) 77 (14, 139) 49 (-14, 111) 65 (2, 128)
Per 20 ounce 12.3 (3.9, 20.7) 8.5 (0.1, 16.9) 8.5 (-1.5, 18.5)
Total tap water (ounces)b
   0-30 443 (25%) Ref   Ref   Ref  
   > 30-61 445 (25%) 41 (-21, 103) 44 (-18, 106) 10 (-52, 73)
   > 61-96 496 (28%) 100 (40, 161) 78 (17, 139) 34 (-30, 97)
   > 96 392 (22%) 85 (21, 149) 43 (-21, 107) 46 (-17, 109)
Per 20 ounce 12.0 (4.0, 20.1) 6.8 (-1.3, 15.0) 5.3 (-4.3, 15.1)
Total water (ounces)b
   0-51 452 (25%) Ref   Ref   Ref  
   > 51-78 439 (25%) 60 (-1, 122) 27 (-34, 87) 10 (-50, 71)
   > 78-114 442 (25%) 67 (5, 128) 39 (-22, 99) 55 (-6, 116)
   > 114 441 (25%) 83 (21, 145) 50 (-11, 111) 37 (-25, 98)
Per 20 ounce 9.8 (1.6, 18.1) 7.3 (-0.8, 15.5) 5.2 (-4.7, 15.2)
  1. aAdjusted for race, education level, annual household income, smoking, pre-pregnancy BMI, vitamin use, parity, employed during last 4 months, infant gender, and study site
  2. bCategorical exposure cutpoints for average data results were slightly higher than the follow-up data
  3. BMI= body mass index.