Table 4.
Risk of inflammatory bowel disease according to quartiles of physical activity
| Quartile groups of physical activity | Crude | Adjusteda | ||
|---|---|---|---|---|
| HRb | 95% CI | HRb | 95% CI | |
| MET hours/week | ||||
| 2nd quartile | 0.94 | (0.75; 1.19) | 0.97 | (0.76; 1.22) |
| 3rd quartile | 0.81 | (0.63; 1.03) | 0.82 | (0.64; 1.05) |
| 4th quartile | 0.86 | (0.68: 1.09) | 0.83 | (0.65; 1.07) |
| Walking (hours/week) | ||||
| 2nd quartile | 0.89 | (0.71; 1.11) | 0.86 | (0.68; 1.09) |
| 3rd quartile | 0.87 | (0.68; 1.13) | 0.83 | (0.63; 1.08) |
| 4th quartile | 0.96 | (0.76; 1.21) | 0.86 | (0.67; 1.11) |
| Housework (hours/week) | ||||
| 2nd quartile | 1.10 | (0.88; 1.37) | 1.12 | (0.88; 1.43) |
| 3rd quartile | 0.95 | (0.74; 1.22) | 0.97 | (0.74; 1.29) |
| 4th quartile | 1.14 | (0.91; 1.44) | 1.12 | (0.84; 1.47) |
| Gardening (hours/week) | ||||
| 1st quartile | 1.10 | (0.88; 1.36) | 0.98 | (0.78; 1.24) |
| 3rd quartile | 0.82 | (0.64; 1.06) | 0.81 | (0.62; 1.04) |
| 4th quartile | 1.01 | (0.80; 1.28) | 0.95 | (0.74; 1.23) |
| Do-it-yourself (hours/week) | ||||
| 1st quartile | 1.27 | (1.01; 1.59) | 1.17 | (0.92; 1.49) |
| 3rd quartile | 1.43 | (1.09; 1.86) | 1.44 | (1.10; 1.90) |
| 4th quartile | 0.99 | (0.76; 1.29) | 0.97 | (0.73; 1.29) |
| Cycling (hours/week) | ||||
| 1st quartile | 1.04 | (0.83; 1.31) | 0.97 | (0.77; 1.23) |
| 3rd quartile | 0.91 | (0.70; 1.16) | 0.91 | (0.70; 1.17) |
| 4th quartile | 0.82 | (0.63; 1.07) | 0.83 | (0.64; 1.09) |
| Sports (hours/week) | ||||
| 1st quartile | 1.03 | (0.72; 1.50) | 0.94 | (0.66; 1.36) |
| 3rd quartile | 0.94 | (0.64; 1.37) | 0.92 | (0.63; 1.35) |
| 4th quartile | 0.96 | (0.64; 1.43) | 0.99 | (0.66; 1.48) |
aAdjusted for age, gender, occupational physical activity, smoking, energy intake, intake of meat, fibre, fermented dairy products and alcohol, nonsteroidal anti-inflammatory drugs, hormone replacement therapy, comorbidity. The six types of activity were mutually adjusted
b1st quartile is the reference for MET hours, walking and housework. 2nd quartile is reference for gardening, do-it-yourself, cycling and sports
Abbreviations: MET metabolic equivalent of task, HR hazard ratio, CI confidence interval