Table 3 Prevalence and odds ratios (OR) from the univariate analysis of water and climate-related risk factors of acute gastrointestinal illness in Quebec rural municipalities, Canada, April 2007 to April 2008
W.n* | Prevalence (%) | OR (95% CI) | p | |
|---|---|---|---|---|
Tap water consumption (1 serving = 250 ml) | 0.999‡ | |||
No water† | 2002 | 5.46 | 1.00 | - |
Less than 4 servings | 2231 | 5.45 | 1.00 (0.76-1.30) | 0.987 |
Between 4 and 8 servings | 2118 | 5.38 | 0.98 (0.75-1.29) | 0.912 |
More than 8 servings | 255 | 5.54 | 1.01 (0.57-1.79) | 0.958 |
Home water treatment | 0.243‡ | |||
Use a water treatment device† | 1739 | 5.33 | 1.00 | - |
Boil water | 286 | 7.80 | 1.50 (0.93-2.42) | 0.098 |
None of them | 4969 | 5.56 | 1.04 (0.82-1.33) | 0.724 |
Water source | 0.143‡ | |||
Community ground water† | 1980 | 5.57 | 1.00 | - |
Community surface water | 1230 | 6.93 | 1.26 (0.94-1.69) | 0.116 |
Domestic wells | 3532 | 5.25 | 0.94 (0.74-1.20) | 0.612 |
Others | 238 | 4.56 | 0.81 (0.43-1.53) | 0.518 |
Septic systems | ||||
Municipal sewer† | 2995 | 5.66 | 1.00 | - |
Septic tanks | 3736 | 5.56 | 0.98 (0.79-1.21) | 0.851 |
Swim | ||||
In a public swimming pool or whirlpool | ||||
Yes | 632 | 8.01 | 1.54 (1.13-2.09) | 0.006 |
No† | 6372 | 5.35 | 1.00 | - |
In a lake or a river | ||||
Yes | 411 | 5.48 | 0.98 (0.63-1.51) | 0.921 |
No† | 6593 | 5.60 | 1.00 | - |
Precipitation§ | ||||
Week 1 (days 1-7) | 0.824‡ | |||
High | 663 | 5.19 | 0.94(0.60-1.47) | 0.790 |
Moderate | 2234 | 5.26 | 0.94 (0.72-1.23) | 0.672 |
Low† | 1917 | 5.62 | 1.00 | - |
Very low | 598 | 4.63 | 0.80(0.50-1.27) | 0.342 |
Week 2 (days 8-14) | 0.962‡ | |||
High | 616 | 4.84 | 0.90 (0.55-1.45) | 0.654 |
Moderate | 2114 | 5.30 | 0.99 (0.70-1.42) | 0.979 |
Low† | 2014 | 5.43 | 1.00 | - |
Very low | 644 | 5.58 | 1.03(0.67-1.59) | 0.894 |
Week 3 (days 15-21) | 0.204‡ | |||
High | 648 | 5.71 | 1.05 (0.70-1.57) | 0.800 |
Moderate | 2115 | 5.53 | 1.02 (0.76-1.37) | 0.894 |
Low† | 2209 | 5.54 | 1.00 | - |
Very low | 626 | 3.47 | 0.61 (0.37-1.00) | 0.051 |
Week 4 (days 22-28) | 0.822‡ | |||
High | 579 | 5.40 | 1.06 (0.65-1.73) | 0.817 |
Moderate | 2151 | 5.14 | 1.01(0.75-1.36) | 0.958 |
Low† | 2052 | 5.20 | 1.00 | - |
Very low | 638 | 6.26 | 1.23 (0.80-1.89) | 0.835 |
Week 5 (days 29-35) | 0.406‡ | |||
High | 662 | 6.09 | 1.04 (0.65-1.68) | 0.855 |
Moderate | 2318 | 4.82 | 0.82 (0.57-1.18) | 0.283 |
Low† | 1831 | 5.94 | 1.00 | - |
Very low | 612 | 4.13 | 0.69 (0.39-1.20) | 0.185 |
Week 6 (days 36-42) | 0.323‡ | |||
High | 603 | 5.15 | 0.71 (0.43-1.19) | 0.201 |
Moderate | 2116 | 5.77 | 1.16 (0.84-1.60) | 0.367 |
Low† | 2095 | 3.59 | 1.00 | - |
Very low | 609 | 5.09 | 0.99 (0.60-1.64) | 0.973 |
Season | 0.012‡ | |||
Winter | 1546 | 6.63 | 1.53 (1.13-2.07) | 0.005 |
Spring | 1822 | 6.40 | 1.47 (1.10-1.98) | 0.009 |
Summer | 1830 | 5.06 | 1.14 (0.85-1.96) | 0.373 |
Fall† | 1807 | 4.43 | 1.00 | - |