Table 2.
Adjusted odds ratios (OR), 95% confidence interval (CI) for odds ratios and P-values from the final multivariate model of the relationship between demographic determinants and acute gastrointestinal illness in randomly selected residents of two Canadian study areas, 2001 to 2003 (N = 5,732)
| Variable | OR | CI for OR | P-value |
| Intercept | 0.15 | (0.10, 0.22) | <0.001 |
| Income | 0.819 a | ||
| <$20 000b | 1.00 | - | - |
| >$20 000 to <$40 000 | 1.23 | (0.75, 2.07) | 0.390 |
| >$40 000 to <$60 000 | 1.06 | (0.64, 1.74) | 0.827 |
| >$60 000 to <$80 000 | 1.26 | (0.75, 2.09) | 0.382 |
| >$80 000 | 1.21 | (0.73, 1.99) | 0.451 |
| Age (years) | <0.001 a | ||
| 0–9 | 1.50 | (1.14, 1.96) | 0.003 |
| 10–14 | 1.23 | (0.84, 1.79) | 0.290 |
| 15–19 | 0.85 | (0.52, 1.38) | 0.510 |
| 20–24 | 1.48 | (1.03, 2.14) | 0.035 |
| 25–64 b | 1.00 | - | - |
| 65–69 | 0.51 | (0.33, 0.80) | 0.003 |
| 70–74 | 0.30 | (0.16, 0.56) | <0.001 |
| 75–84 | 0.36 | (0.21, 0.61) | <0.001 |
| >84 | 0.27 | (0.08, 0.89) | 0.031 |
| Gender | <0.001a | ||
| Male b | 1.00 | - | - |
| Female | 2.46 | (1.54, 3.93) | <0.001 |
| Income*Gender Interaction | 0.017 a | ||
| >$20 000 to <$40 000 (Female) | 0.46 | (0.25, 0.84) | 0.011 |
| >$40 000 to <$60 000 (Female) | 0.50 | (0.28, 0.91) | 0.022 |
| >$60 000 to <$80 000 (Female) | 0.56 | (0.30, 1.02) | 0.059 |
| >$80 000 (Female) | 0.35 | (0.19, 0.64) | <0.001 |
a Global P-value for Wald test of Ho: same level of risk in all categories
b reference group