Characteristics of participants with PDPS with faster and slower onset of symptoms
| Characteristics | Fast onset (≤10 min) | Slow onset (>10 min) | P value | ES |
| Participants, n (%) | 14 (32) | 30 (68) | n/a | n/a |
| Female, n (%) | 8 (57) | 22 (73) | 0.316 | Phi=0.16 |
| Age (years) | 21.5 (IQR 7.0) | 22.0 (IQR 6.3) | 0.577 | r=0.08 |
| BMI (kg/m2) | 24.0 (IQR 3.0) | 24.0 (IQR 5.9) | 0.821 | r=0.03 |
| Sport participation (h/week) | 3.1 (SD±2.1, R 6.0) | 3.0 (SD±2.0, R 7.0) | 0.934 | d=0.03 |
| Tegner Score (0–10) | 4.0 (IQR 2.3) | 3.0 (IQR 4.0) | 0.096 | r=0.25 |
| VAS-W (0–10) | 7.0 (IQR 2.0) | 5.0 (IQR 3.0) | <0.001 | r=0.50 |
| Bilateral PFP, n (%) | 10 (71) | 24 (80) | 0.701 | Phi=0.10 |
| Symptom duration (months) | 42.0 (IQR 87.0) | 40.0 (IQR 48.0) | 0.696 | r=0.06 |
| AKPS (0–100) | 68.0 (IQR 10.0) | 74.0 (IQR 16.3) | 0.109 | r=0.24 |
| TSK (17–68) | 32.5 (IQR 8.0) | 32.5 (IQR 10.5) | 0.940 | r=0.01 |
| VAS-W sitting (0–10) | 6.0 (IQR 2.0) | 5.0 (IQR 4.0) | 0.038 | r=0.31 |
Data are presented as numbers (percentages), mean (±SD and range (R)) or median (IQR 25%–75%).
AKPS, Anterior Knee Pain Scale; BMI, body mass index; ES, effect size; h/week, hours per week; n, number; n/a, not applicable; PFP, patellofemoral pain; TSK, Tampa Scale for Kinesiophobia; VAS-W, Visual Analogue Scale for Worst pain.