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Table 3 Relationship between country of birth and rates of primary joint replacement in private and public hospitals

From: Reduced rates of primary joint replacement for osteoarthritis in Italian and Greek migrants to Australia: the Melbourne Collaborative Cohort Study

  Primary joint replacement in private hospitals (n = 760) Primary joint replacement in public hospitals (n = 249) Heterogeneity of hazard ratiosa
  Incidence rate (95% CI)b Hazard ratio (95% CI)a Incidence rate (95% CI)b Hazard ratio (95% CI)a P value
Australia 5.1 (4.7–5.5) 1.00 (reference) 1.2 (1.0–1.4) 1.00 (reference) -
UK 3.6 (2.8–4.8) 0.76 (0.57–1.01) 1.7 (1.1–2.5) 1.50 (0.97–2.32) 0.01
Italy 1.7 (1.3–2.3) 0.24 (0.18–0.33)c 1.7 (1.3–2.3) 0.99 (0.69–1.41) < 0.0001
Greece 0.5 (0.3–0.9) 0.08 (0.04–0.14)c 1.4 (1.0–2.1) 0.92 (0.61–1.39) < 0.0001
Italy/Greece combined 1.1 (0.9–1.5) 0.17 (0.13–0.23)c 1.6 (1.3–2.0) 0.96 (0.72–1.29) < 0.0001
  1. aAdjusted for age, gender, body mass index, and education level. bPer 1,000 person-years. cStatistically significant, P < 0.001. CI, confidence interval.