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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

From: The association between farming activities, precipitation, and the risk of acute gastrointestinal illness in rural municipalities of Quebec, Canada: a cross-sectional study

  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 -
  1. * Weighted n, weighted by age and sex to the population of the study area, according to the data from the 2006 Canadian census of population.
  2. † Reference.
  3. ‡ Global p-value.
  4. § Each one-week-period [prior to the onset of AGI (for cases) or the interview date (for non-cases)] was modelled separately. Winter season was excluded for the analysis because of very cold winters in Quebec, with precipitation taking mostly the form of snow during that season.