Table 8.
Responsiveness of the Korean New KSS compared with the Korean WOMAC and Korean SF-36
| Questionnaire | Mean of change |
SD | SRM* (95% CI) |
p Value |
|---|---|---|---|---|
| Korean New KSS | ||||
| Men (n = 53) | ||||
| Symptoms (3 items)/25 points | 13.74 | 5.27 | 2.61 (2.12–3.20) | < 0.001 |
| Satisfaction score (5 items)/40 points | 19.83 | 11.93 | 1.66 (1.21–2.06) | < 0.001 |
| Expectation score (3 items)/15 points | −1.34 | 3.73 | −0.36 (−0.60 to −0.10) | 0.006 |
| Activity (19 items)/100 points | 32.70 | 21.90 | 1.49 (1.12–1.87) | < 0.001 |
| Amount (30 items)/180 points | 64.92 | 29.05 | 2.24 (1.80–2.65) | < 0.001 |
| Korean WOMAC | ||||
| Pain/20 points | −8.43 | 4.23 | −1.99 (−2.45 to −1.60) | < 0.001 |
| Stiffness/8 points | −.2.45 | 2.26 | −1.08 (−1.41 to −0.81) | < 0.001 |
| Function/68 points | −20.28 | 13.70 | −1.48 (−1.91 to −1.00) | < 0.001 |
| Total/96 points | −31.17 | 18.29 | −1.70 (−2.12 to −1.22) | < 0.001 |
| Korean SF-36 | ||||
| Physical function | 13.49 | 9.32 | 1.45 (1.06–1.78) | < 0.001 |
| Role-physical | 11.10 | 13.39 | 0.83 (0.53–1.17) | < 0.001 |
| Bodily pain | 17.38 | 11.16 | 1.56 (1.19–1.98) | < 0.001 |
| General health | 4.17 | 8.31 | 0.50 (0.20–0.76) | < 0.001 |
| Vitality | 5.83 | 8.24 | 0.71 (0.39–0.95) | < 0.001 |
| Social function | 11.11 | 13.10 | 0.84 (0.54–1.12) | < 0.001 |
| Role-emotion | 11.58 | 15.15 | 0.76 (0.51–1.01) | < 0.001 |
| Mental health | 3.55 | 10.30 | 0.34 (0.05–0.61) | 0.008 |
| Physical component summary | 13.26 | 9.44 | 1.41 (1.05–1.81) | < 0.001 |
| Mental component summary | 4.90 | 10.39 | 0.47 (0.22–0.70) | < 0.001 |
| Korean New KSS | ||||
| Women (n = 106) | ||||
| Symptoms (3 items)/25 points | 14.95 | 6.91 | 2.16 (1.70–2.59) | < 0.001 |
| Satisfaction score (5 items)/40 points | 15.10 | 8.90 | 1.70 (1.44–1.97) | < 0.001 |
| Expectation score (3 items)/15 points | −1.59 | 3.71 | −0.43 (−0.63 to −0.22) | < 0.001 |
| Activity (19 items)/100 points | 40.50 | 22.29 | 1.82 (1.39–2.18) | < 0.001 |
| Amount (30 items)/180 points | 68.95 | 34.70 | 1.99 (1.60–2.35) | < 0.001 |
| Korean WOMAC | ||||
| Pain/20 points | −9.99 | 4.85 | −2.06 (−2.36 to −1.76) | < 0.001 |
| Stiffness/8 points | −3.04 | 2.81 | −1.08 (−1.33 to −0.81) | < 0.001 |
| Function/68 points | −29.50 | 17.04 | −1.73 (−1.96 to −1.50) | < 0.001 |
| Total/96 points | −42.53 | 23.12 | −1.84 (−2.07 to −1.60) | < 0.001 |
| Korean SF-36 | ||||
| Physical function | 16.22 | 9.70 | 1.67 (1.44–1.94) | < 0.001 |
| Role-physical | 14.83 | 16.44 | 0.90 (0.66–1.15) | < 0.001 |
| Bodily pain | 14.76 | 13.20 | 1.12 (0.80–1.35) | < 0.001 |
| General health | 4.57 | 27.36 | 0.17 (−0.04 to 0.24) | 0.040 |
| Vitality | 8.18 | 12.12 | 0.68 (0.47–0.84) | < 0.001 |
| Social function | 11.96 | 15.14 | 0.79 (0.59–1.00) | < 0.001 |
| Role-emotion | 16.80 | 17.38 | 0.97 (0.75–1.17) | < 0.001 |
| Mental health | 7.69 | 11.92 | 0.65 (0.47–0.80) | < 0.001 |
| Physical component summary | 12.52 | 10.92 | 1.15 (0.91–1.39) | < 0.001 |
| Mental component summary | 9.18 | 13.76 | 0.67 (0.48–0.85) | < 0.001 |
KSS = Knee Society Score; *calculated as the mean change between the preoperative and 12-month scores divided by the SD of the change in score; standardized response mean (SRM) of 0.2–0.5 = small change, 0.5–0.8 = moderate change, and ≥ 0.8 = large change; paired t-test, p < 0.05.