Table 2—

Overall and urbanization status-specific incidence densities and relative hazards of nontransport accident hip fracture (ICD-9 820) in the diabetic and control groups

Variables*Control group
Diabetic group
Adjusted HR (95% CI) in association with diabetic group
No. of patientsNo. of eventsID (per 1,000 patient-years) (95% CI)No. of patientsNo. of eventsID (per 1,000 patient-years) (95% CI)
Men
    Urban areas149,1951,7912.61 (2.49–2.73)152,2462,3783.07 (2.94–3.19)1.22 (1.14–1.29)§
    Rural areas75,0858012.24 (2.08–2.39)72,0321,0512.87 (2.69–3.04)1.43 (1.30–1.56)§
    Total227,3032,6242.48 (2.38–2.57)227,2893,4602.99 (2.89–3.09)1.28 (1.21–1.34)
Women
    Urban areas166,4573,2514.21 (4.07–4.36)166,7145,8106.70 (6.53–6.88)1.67 (1.60–1.74)§
    Rural areas87,8441,8074.21 (4.02–4.40)87,3213,0906.80 (6.56–7.04)1.82 (1.72–1.93)§
    Total255,7315,1174.20 (4.09–4.32)257,4989,0196.74 (6.60–6.88)1.72 (1.66–1.78)
  • * Inconsistency between total population and population summed for individual variable is due to missing information.

  • Based on Poisson assumption, ID, incidence density.

  • Based on Cox proportional hazard regression model; P value for the interaction between diabetes and urbanization status was 0.0053 and 0.0248 for men and women, respectively.

  • § Adjusted for age as a continuous variable and geographic area.

  • Adjusted for age as a continuous variable, geographic area, and urbanization status.