Table 1. Baseline Characteristics for the Full Sample and by Buckling Status.
Mean (SD) is shown unless otherwise specified.
| Full sample (212 persons) | No buckling (136 persons) | Yes buckling (76 persons) | ||
|---|---|---|---|---|
| Overall knee confidence, higher score worse, number (%) | 0 | 38 (17.9%) | 35 (25.7%) | 3 (3.9%) |
| 1 | 96 (45.3) | 62 (45.6) | 34 (44.7) | |
| 2 | 63 (29.7) | 36 (26.5) | 27 (35.5) | |
| 3 | 15 (7.1) | 3 (2.2) | 12 (15.8) | |
| Buckling confidence, higher score better, number (%) | 0 | 29 (13.7%) | 6 (4.4%) | 23 (30.3%) |
| 1 | 71 (33.5) | 38 (27.9) | 33 (43.4) | |
| 2 | 71 (33.5) | 51 (37.5) | 20 (26.3) | |
| 3 | 41 (19.3) | 41 (30.1) | 0 (0) | |
| Varus-valgus excursion during gait, ° | 7.1 (2.6) | 7.2 (2.6) | 6.9 (2.5) | |
| Maximum varus-valgus angular velocity during gait, °/second | 31.9 (17.1) | 33.3 (18.6) | 29.6 (13.7) | |
| Age, years | 64.6 (10.1) | 65.8 (9.7) | 62.6 (10.6) | |
| Women, number (%) | 163 (76.9%) | 106 (77.9%) | 57 (75.0%) | |
| BMI, kg/m2 | 28.5 (5.7) | 28.3 (5.8) | 29.0 (6.0) | |
| Self-efficacy, higher score better | 25.5 (5.2) | 26.7 (3.9) | 23.4 (6.5) | |
| Depressive symptoms | 1.6 (1.3) | 1.4 (1.1) | 1.8 (1.6) | |
| Knee extensor strength, N-M/kg (of knee with worse buckling confidence) | 92.9 (30.6) | 95.9 (29.1) | 87.4 (32.7) | |
| K/L grade, worse of R and L, number (%) | 0 | 2 (0.9%) | 2 (1.5%) | 9 (0.0%) |
| 1 | 21 (9.9) | 12 (8.8) | 9 (11.8) | |
| 2 | 103 (48.6) | 64 (47.1) | 39 (51.3) | |
| 3 | 34 (16.0) | 24 (17.7) | 10 (13.2) | |
| 4 | 52 (24.5) | 34 (25.0) | 18 (23.7) | |
| Knee pain | 9.2 (7.7) | 7.1 (6.5) | 12.9 (8.1) | |
| Basic function, higher score better | 71.5 (13.2) | 74.8 (12.7) | 65.7 (12.2) | |
| Advanced function, higher score better | 54.5 (13.2) | 57.1 (11.9) | 49.9 (14.3) | |