Table 1.
Total number of femur and humerus shaft fractures, sex-specific, age-specific incidence rate per 1000 children and 95% confidence intervals (CIs). Crude odds ratio (OR) and adjusted OR for association between sex (girl reference) and femur and humerus shaft fractures by age group
| Incidence per 1000 children (CI) | Crude OR (CI) | Adjusteda OR (CI) | |||
|---|---|---|---|---|---|
| Age | Girls | Boys | Total | ||
| Femur shaft fracture | |||||
| Birth-related | 0.010 (0.005–0.014) | 0.015 (0.009–0.020) | 0.024 (0.017–0.031) | 1.40 (0.77–2.55) | 1.30 (0.66–2.58) |
| < 6 months | 0.025 (0.018–0.032) | 0.030 (0.022–0.037) | 0.055 (0.045–0.065) | 1.09 (0.74–1.62) | 1.09 (0.72–1.64) |
| 6–12 months | 0.053 (0.043–0.064) | 0.046 (0.037–0.056) | 0.100 (0.086–0.113) | 0.81 (0.61–1.08) | 0.79 (0.59–1.07) |
| Humerus shaft fracture | |||||
| Birth-related | 0.035 (0.027–0.043) | 0.066 (0.055–0.078) | 0.101 (0.087–0.115) | 1.81 (1.34–2.45) | 1.68 (1.22–2.30) |
| < 6 months | 0.020 (0.014–0.027) | 0.031 (0.023–0.039) | 0.052 (0.042–0.062) | 1.43 (0.95–2.15) | 1.46 (0.96–2.23) |
| 6–12 months | 0.011 (0.006–0.016) | 0.014 (0.082–0.019) | 0.025 (0.018–0.032) | 1.11 (0.62–1.99) | 1.20 (0.65–2.22) |
aAdjusted for large-for-gestational age (> 2.5th percentile), small-for-gestational age (< 2.5th percentile), preterm-born, shoulder dystocia
Significant odds ratios are written in bold