Table 3.
Hip fracture incidence rates and hazard rate (HR) with 95% confidence intervals (CI) for the effect of leisure time physical activity on hip fracture among men and women in the Swedish National March Cohort
| Quartiles of leisure time physical activity levels (METh/day) | ||||
|---|---|---|---|---|
| <1.1 | 1.1–1.8 | 1.8–3.1 | >3.1 | |
| Number of incidents of hip fracture | 239 | 226 | 184 | 148 |
| Person-years | 71,052 | 74,122 | 73,683 | 69,654 |
| Incidence ratea | 330.2 | 280.5 | 244.6 | 238.0 |
| HR (95% CI)b | 1.00 (reference) | 0.85 (0.71–1.02) | 0.75 (0.62–0.91) | 0.76 (0.62–0.93) |
| HR (95% CI)c | 1.00 (reference) | 0.86 (0.70–1.06) | 0.75 (0.61–0.94) | 0.70 (0.55–0.89) |
| HR (95% CI)d | 1.00 (reference) | 0.92 (0.74–1.15) | 0.83 (0.65–1.04) | 0.76 (0.59–0.98) |
aIncidence rates are adjusted for age and presented per 100,000 person-years
bAdjusted for age at enrollment and gender
cAdjusted for age at enrollment, gender, BMI, educational level, cigarette smoking status, calcium and D-vitamin intake, diabetes, osteoarthritis and Charlson comorbidity index
dModel c additionally adjusted for total daily household activities and work-related physical activity