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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

From: The epidemiology of infant shaft fractures of femur or humerus by incidence, birth, accidents, and other causes

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)
  1. aAdjusted for large-for-gestational age (> 2.5th percentile), small-for-gestational age (< 2.5th percentile), preterm-born, shoulder dystocia
  2. Significant odds ratios are written in bold