Table 1.
Population characteristics
| Characteristic | Hip replacement | Knee replacement |
|---|---|---|
| No. of patient | 312,079 (48.7) | 328,753 (51.3) |
| Mean (SD) OHS or OKS | 17.4 (8.25) | 18.3 (7.87) |
| Mean (SD) EQ-5D | 0.33 (0.33) | 0.39 (0.32) |
| Long-standing problems, n (%) | 57,827 (18.5) | 141,559 (43.1) |
| Age, mean (range) | 68 (18–105) | 69 (18–102) |
| Gender, n (%) | ||
| Male | 126,925 (40.7) | 140,971 (42.9) |
| Female | 184,982 (59.3) | 187,525 (57.0) |
| Missing, not stated | 172 | 257 |
| Socioeconomic status by quintile group, n (%) | ||
| 1 (least deprived) | 74,380 (23.4) | 69,582 (21.2) |
| 2 | 76,164 (24.4) | 74,799 (22.8) |
| 3 | 55,793 (17.9) | 62,851 (19.1) |
| 4 | 52,194 (16.7) | 60,177 (18.3) |
| 5 (most deprived) | 50,408 (16.2) | 58,327 (17.7) |
| Missing | 3140 | 3017 |
| Ethnicity, n (%) | ||
| White or White British | 271,959 (98.3) | 279,159 (94.5) |
| Mixed background | 546 (0.19) | 836 (0.28) |
| Asian or Asian British | 1239 (0.45) | 10,445 (3.53) |
| Black or Black British | 1703 (0.62) | 3347 (1.13) |
| Chinese or other ethnic | 1150 (0.42) | 1706 (0.58) |
| Missing | 35,482 | 33,260 |
| Chronic disease, n (%) | ||
| Heart disease | 53,277 (17.1) | 60,755 (18.5) |
| High Blood pressure | 151,163 (48.4) | 187,815 (57.1) |
| Stroke | 3227 (1.03) | 3530 (1.07) |
| Leg pain due to poor circulation | 5140 (1.65) | 4955 (1.51) |
| Lung Disease | 43,481 (13.9) | 51,176 (15.6) |
| Diabetes | 29,535 (9.46) | 44,813 (13.6) |
| Kidney Disease | 16,428 (5.26) | 18,000 (5.48) |
| Diseases of the Nervous System | 8483 (2.72) | 9741 (2.96) |
| Liver Disease | 1888 (0.60) | 1931 (0.59) |
| Cancer | 6354 (2.04) | 5545 (1.69) |
| Depression | 13,367 (4.28) | 14,814 (4.51) |
| Count of chronic diseases, n (%) | ||
| 0 | 113,479 (36.4) | 94,290 (28.7) |
| 1 | 107,139 (34.3) | 119,012 (36.2) |
| 2 | 59,976 (19.2) | 75,202 (22.9) |
| 3 | 22,929 (7.35) | 29,761 (9.05) |
| 4+ | 8556 (2.74) | 10,488 (3.19) |