Table 2.
Birth weight results for daily bottled, cold tap, total tap, and total water intake
| Follow-up data | Average of baseline and follow-up data |
||||||
|---|---|---|---|---|---|---|---|
| Unadjusted | Adjusteda | Adjusteda | |||||
| Exposure | n (%) | β | 95% CI | β | 95% CI | β | 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) | |
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
bCategorical exposure cutpoints for average data results were slightly higher than the follow-up data
BMI= body mass index.