Table 7.
Adjusted mean differences (AMD) with 95% confidence intervals (CI) of EQ-5D index and OHS/OKS during the COVID-19 lockdown compared with the control periods. Analyses were adjusted for age, sex, BMI, previous surgery on the operated joint, indication, ASA score, Charnley classification, type of hospital, and socioeconomic status score
| Factor | Preoperative AMD (CI) | p-value | 3-/6-month postoperative AMD (CI) | p-value | 12-month postoperative AMD (CI) | p-value |
|---|---|---|---|---|---|---|
| Total hip arthroplasty | n = 15,007 | n = 12,469 | n = 12,011 | |||
| Without interaction terms | ||||||
| EQ-5D index a | –0.021 (–0.029 to –0.013) | < 0.001 | 0.008 (0.001 to 0.015) | 0.03 | 0.010 (0.003 to 0.016) | 0.003 |
| With interaction terms | no relevant interaction terms | |||||
| BMI > 30 | –0.019 (–0.035 to –0.002) | 0.02 | ||||
| EQ-5D index a | 0.012 (0.005 to 0.020) | 0.002 | ||||
| Infections ≥ 50 per 105 | –0.012 (–0.022 to –0.001) | 0.03 | ||||
| EQ-5D index a | 0.014 (0.007 to 0.022) | < 0.001 | ||||
| Without interaction terms | ||||||
| OHS a | –0.95 (–1.30 to –0.60) | < 0.001 | 0.44 (0.13 to 0.74) | 0.005 | 0.71 (0.42 to 1.00) | < 0.001 |
| With interaction terms | no relevant interaction terms | no relevant interaction terms | ||||
| Infections ≥ 50 per 10 5 | –0.58 (–1.03 to –0.13) | 0.01 | ||||
| OHS a | 0.93 (0.60 to 1.27) | < 0.001 | ||||
| Total knee arthroplasty | n = 10,542 | n = 11,134 | n = 9,214 | |||
| Without interaction terms | ||||||
| EQ-5D index a | –0.003 (–0.012 to 0.007) | 0.6 | 0.000 (–0.007 to 0.007) | 1 | 0.013 (0.006 to 0.021) | < 0.001 |
| With interaction terms | – b | – b | no relevant interaction terms | |||
| Without interaction terms | ||||||
| OKS a | –0.03 (–0.36 to 0.41) | 0.9 | 0.12 (–0.22 to 0.47) | 0.5 | 0.45 (0.07 to 0.83) | 0.02 |
| With interaction terms | – b | – b | no relevant interaction terms |
a
A higher EQ-5D index, OHS/OKS represents an improvement.
b
Interaction terms were not analyzed in non-significant associations.