Table 4 Multivariable conditional logistic regression models of cryptosporidiosis among patients with AIDS according to pattern of tap water consumption and adjusted for potential confounders
Cases (n = 49) | Controls (n = 99) | |||||
|---|---|---|---|---|---|---|
Models and variables | N | (%) | N | (%) | Odds Ratio | 95% CI |
Model 1 | ||||||
Tap water at home | ||||||
Never | 2 | (4) | 31 | (31) | 1.00 | Reference |
Sometimes | 20 | (41) | 30 | (30) | 7.70 | 1.63, 36.3 |
Always | 27 | (55) | 38 | (38) | 6.76 | 1.37, 33.5 |
Tap water outside home | ||||||
Never | 29 | (59) | 81 | (82) | 1.00 | Reference |
Sometimes | 4 | (8) | 8 | (8) | 1.59 | 0.38, 6.73 |
Always | 16 | (33) | 10 | (10) | 3.16 | 1.23, 8.13 |
Exposure to fecal materiala | ||||||
No | 42 | (86) | 87 | (88) | 1.00 | Reference |
Yes | 7 | (14) | 12 | (12) | 1.03 | 0.32, 3.36 |
Filtered municipal water | ||||||
Filtered | 27 | (55) | 51 | (52) | 1.00 | Reference |
Mixed | 14 | (29) | 37 | (37) | 0.77 | 0.35, 1.74 |
Unfiltered | 11 | (16) | 8 | (11) | 1.19 | 0.34, 4.20 |
Model 2: Composite water variable | ||||||
Tap water exposureb | ||||||
Lowest exposure | 2 | (4) | 29 | (29) | 1.00 | Reference |
Intermediate exposure | 35 | (71) | 64 | (65) | 6.92 | 1.55, 30.9 |
Highest exposure | 12 | (24) | 6 | (6) | 23.6 | 4.08, 137 |
Exposure to fecal materiala | ||||||
No | 42 | (86) | 87 | (88) | 1.00 | Reference |
Yes | 7 | (14) | 12 | (12) | 0.96 | 0.30, 3.06 |
Filtered municipal water | ||||||
Filtered | 27 | (55) | 51 | (52) | 1.00 | Reference |
Mixed | 14 | (29) | 37 | (37) | 0.81 | 0.37, 1.77 |
Unfiltered | 11 | (16) | 8 | (11) | 1.23 | 0.38, 4.02 |