Relation of KR to mortality risk by age quartiles in a propensity score-matched* cohort of men and women with knee osteoarthritis
| KR | Non-KR | ||||||
|---|---|---|---|---|---|---|---|
| Age (years) quartiles | Death (N) | PY | Mortality rate (N/1000 PY) | Death | PY | Mortality rate (N/1000 PY) | HR (95% CI) |
| Q1: ≤63 | 76 | 12480.9 | 6.09 | 67 | 12509.8 | 5.36 | 1.20 (0.84 to 1.71) |
| Q2: >63 and ≤71 | 230 | 19455.5 | 11.82 | 289 | 18918.2 | 15.28 | 0.80 (0.66 to 0.96) |
| Q3: >71 and ≤79 | 503 | 20556.7 | 24.47 | 618 | 20164.3 | 30.65 | 0.75 (0.66 to 0.86) |
| Q4: >79 | 350 | 8299.2 | 42.17 | 444 | 7817.0 | 56.80 | 0.65 (0.55 to 0.77) |
Test for interaction p<0.0001.
*Propensity score derived using covariates listed in table 1.
KR, knee replacement; N, number; PY, person-years.