Table 3 Preoperative severity of joint problems (OHS in hip replacement and OKS in knee replacement) and likelihood of long-standing problems by the number of chronic diseases (95% CI, P-value for trend) (adjusted according to age, sex, ethnicity and SES)
Count of chronic diseases | Severity of joint problems (0 worse and 48 best) | Functional status (0 worst 24 best) | Pain (0 worst 24 best) | Long-standing joint problems (duration > 5 years pre-operatively) | ||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
Mean score | Adjusted difference (95% CI) | P-value | Mean score | Adjusted difference (95% CI) | P-value | Mean score | Adjusted difference (95% CI) | P-value | % | Adjusted OR (95% CI) | P-value | |
Hip replacement:OHS | ||||||||||||
0 | 18.8 | Reference | 10.6 | Reference | 8.21 | Reference | 21.3 | Reference | ||||
1 | 17.4 | −1.45 (−1.52, −1.38) | < 0.001 | 9.73 | −0.79 (−0.83, − 0.76) | < 0.001 | 7.67 | − 0.66 (− 0.69, − 0.62) | < 0.001 | 17.3 | 0.93 (0.91, 0.95) | 0.076 |
2 | 16.2 | −2.79 (− 2.87, − 2.70) | 9.03 | −1.52 (− 1.56, − 1.47) | 7.17 | −1.28 (− 1.32, − 1.23) | 16.5 | 0.98 (0.95, 1.00) | ||||
3 | 14.9 | −4.15 (− 4.27, − 4.04) | 8.31 | − 2.23 (− 2.30, − 2.17) | 6.58 | − 1.92 (− 1.98, − 1.86) | 16.1 | 1.02 (0.98, 1.06) | ||||
4+ | 13.3 | −5.79 (− 5.96, − 5.61) | 7.42 | − 3.13 (− 3.23, − 3.03) | 5.89 | − 2.66 (− 2.75, − 2.56) | 17.5 | 1.15 (1.09, 1.23) | ||||
Knee replacement:OKS | ||||||||||||
0 | 19.5 | Reference | 12.5 | Reference | 7.01 | Reference | 45.7 | Reference | ||||
1 | 18.5 | −1.06 (−1.12, −0.99) | < 0.001 | 11.7 | −0.72 (− 0.76, − 0.68) | < 0.001 | 6.77 | −0.34 (− 0.37, − 0.31) | < 0.001 | 42.2 | 0.95 (0.93, 0.97) | 0.663 |
2 | 17.6 | −2.16 (− 2.24, − 2.09) | 11.0 | −1.50 (− 1.51, − 1.42) | 6.51 | − 0.70 (− 0.73, − 0.67) | 41.9 | 0.97 (0.95, 0.99) | ||||
3 | 16.5 | −3.38 (− 3.48, − 3.28) | 10.3 | −2.28 (− 2.34, − 2.22) | 6.17 | − 1.10 (− 1.15, − 1.06) | 41.8 | 0.98 (0.96, 1.01) | ||||
4+ | 15.1 | −4.79 (− 4.94, − 4.64) | 9.39 | −3.21 (− 3.31, − 3.11) | 5.75 | − 1.58 (− 1.64, − 1.51) | 41.9 | 0.99 (0.95, 1.04) | ||||