| |
Cases (n = 49)
|
Controls (n = 99)
| | |
|---|
|
Variable
|
N
|
(%)
|
N
|
(%)
|
Odds Ratio
|
95% CI
|
|---|
|
Tap water at home
| | | | | | |
|
Never
|
2
|
(4)
|
31
|
(31)
|
1.00
|
Reference
|
|
Sometimes
|
20
|
(41)
|
30
|
(30)
|
9.54
|
2.06, 44.1
|
|
Always
|
27
|
(55)
|
38
|
(38)
|
9.78
|
2.14, 44.7
|
|
Tap water outside home
| | | | | | |
|
Never
|
29
|
(59)
|
81
|
(82)
|
1.00
|
Reference
|
|
Sometimes
|
4
|
(8)
|
8
|
(8)
|
2.00
|
0.53, 7.50
|
|
Always
|
16
|
(33)
|
10
|
(10)
|
4.20
|
1.76, 10.0
|
|
Tap water compositea
| | | | | | |
|
Lowest exposure
|
2
|
(4)
|
29
|
(29)
|
1.00
|
Reference
|
|
Intermediate exposure
|
35
|
(71)
|
64
|
(65)
|
7.08
|
1.59, 31.4
|
|
Highest exposure
|
12
|
(24)
|
6
|
(6)
|
24.3
|
4.21, 139
|
|
Bottled water at home
| | | | | | |
|
Never
|
25
|
(51)
|
38
|
(38)
|
1.00
|
Reference
|
|
Sometimes
|
24
|
(49)
|
40
|
(40)
|
0.81
|
0.37, 1.76
|
|
Always
|
0
|
(0)
|
21
|
(21)
|
0.09c
|
0.03, 0.37
|
|
Bottled water outside home
| | | | | | |
|
Never
|
17
|
(35)
|
36
|
(36)
|
1.00
|
Reference
|
|
Sometimes
|
10
|
(20)
|
20
|
(20)
|
0.97
|
0.28, 3.40
|
|
Always
|
22
|
(45)
|
43
|
(43)
|
0.75
|
0.28, 2.06
|
|
Bottled water compositeb
| | | | | | |
|
Lowest exposure
|
11
|
(22)
|
17
|
(17)
|
1.00
|
Reference
|
|
Intermediate exposure
|
38
|
(78)
|
70
|
(71)
|
0.66
|
0.26, 1.68
|
|
Highest exposure
|
0
|
(0)
|
12
|
(12)
|
0.17c
|
0.06, 0.83
|
|
Filtered municipal water
| | | | | | |
|
Filtered
|
27
|
(55)
|
51
|
(52)
|
1.00
|
Reference
|
|
Mixed
|
14
|
(29)
|
37
|
(37)
|
0.75
|
0.35, 1.58
|
|
Unfiltered
|
8
|
(16)
|
11
|
(11)
|
1.36
|
0.44, 4.16
|
-
aLowest = answered never consumed tap water both inside and outside the home; Highest = answered always consumed tap water both inside and outside the home; Intermediate = all other responses bLowest = answered never consumed bottled water both inside and outside the home; Highest = answered always consumed bottled water both inside and outside the home; Intermediate = all other responses cUnmatched, median-unbiased odds ratio estimate and exact 95% confidence intervals calculated directly from the mid-p function based on the hypergeometric model (see methods)
