Demographic data and drop-out analysis from the 18-month follow-up
| Lost to follow-up (n=93) | Total (n=173) | P value | Physically active* (n=148) | Physically inactive† (n=25) | P value | |
| Female | 40 (45%) | 81 (47%) | 0.606‡ | 74 (50%) | 7 (28%) | 0.066‡ |
| BMI | 23.8 (2.6) | 24.2 (2.6) | 0.049§ | 24.1 (2.4) | 25.0 (3.2) | 0.094§ |
| Age at surgery | 25.3 (8.3) | 31.0 (11.3) | < 0.001§ | 30.8 (11.2) | 32.2 (12.1) | 0.56§ |
| Tegner preinjury | ||||||
| ≤ 5 | 15 (19.2%) | 44 (25.5%) | 37 (25.0%) | 7 (28%) | ||
| 6 | 8 (10.3%) | 21 (12.1%) | 18 (12.2%) | 3 (12%) | ||
| 7 | 5 (6.4%) | 32 (18.5%) | 27 (18.2%) | 5 (20.0%) | ||
| 8 | 18 (23.1%) | 33 (19.1%) | 29 (19.6%) | 4 (16.0%) | ||
| 9 | 21 (26.9%) | 34 (19.7%) | 30 (20.3%) | 4 (16.0%) | ||
| 10 | 11 (14.1%) | 9 (5.2%) | 0.009¶ | 7 (4.7%) | 2 (8.0%) | 0.58¶ |
| Physical activity (minutes/week) | – | 345 (0–540) | 360 (150–540) | 0 (0–135) | n.a. | |
For non-ordered categorical variables, n (%) is presented. For ordered categorical variables median (minimum-maximum) is presented. For continuous variables, the mean (SD) is presented.
P-value < 0.05 indicates a statistical significance.
*Physically active≥150 min/week.
†Physically inactive<150 min/week.
‡For comparisons between groups, Fisher’s exact test (lowest 1-sided p value multiplied by 2) was used for dichotomous variables.
§The Mantel-Haenszel χ2 test was used for ordered categorical variables.
¶Fisher’s non-parametric permutation test was used for continuous variables.
BMI, body mass index; n.a., not applicable; Tegner, Tegner Activity Scale.