Table 2.
Characteristics of the participants who had missing data about knee pain or not
| Missing data (−) (n = 804) | Missing data (+) (n = 329) | |
|---|---|---|
| Age (y) | ||
| 8 | 264 (32.8) | 28 (8.5) |
| 9 | 96 (11.9) | 10 (3.0) |
| 10 | 89 (11.1) | 20 (6.1) |
| 11 | 20 (2.5) | 82 (24.9) |
| 12 | 210 (26.1) | 52 (15.8) |
| 13 | 120 (14.9) | 14 (4.3) |
| 14 | 5 (0.6) | 123 (37.4) |
| Sex | ||
| Girls | 407 (50.6) | 175 (53.2) |
| Boys | 397 (49.4) | 154 (46.8) |
| BMI (kg/m2) | 17.1 ± 2.5 | 18.3 ± 2.5 |
| Lower limb tightness | ||
| Rt HBD (cm) | 1.0 ± 2.3 | 2.2 ± 3.7 |
| Lt HBD (cm) | 0.9 ± 2.2 | 2.1 ± 3.6 |
| Rt SLRA (deg) | 77.4 ± 13.6 | 75.3 ± 11.6 |
| Lt SLRA (deg) | 77.5 ± 13.8 | 75.4 ± 11.7 |
| Rt DFA (deg) | 16.0 ± 7.1 | 14.8 ± 6.5 |
| Lt DFA (deg) | 15.6 ± 7.0 | 14.6 ± 6.3 |
| HSS Pedi-FABS | 15.9 ± 7.9 | 14.6 ± 8.4 |
Data on age and sex are presented as number (prevalence), while BMI, HBD, SLRA, DFA, and HSS Pedi-FABS are presented as mean ± standard deviation
BMI Body mass index, HBD Heel-buttock distance, SLRA Straight leg raising angle, DFA Dorsiflexion angle of the ankle joint with knee extension, HSS Pedi-FABS The Hospital for Special Surgery Pediatric Functional Activity Brief Scale