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

-


* 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.

† Reference.

‡ Global p-value.

§ 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.

Febriani et al. BMC Public Health 2010 10:48   doi:10.1186/1471-2458-10-48

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