Table 1.
Total scores and subscale scores, differences over time, and test–retest reliability of the Swedish version of the Banff Patellar Instability Instrument (BPII) 2.0 and the Knee injury and Osteoarthritis Outcome Score for children (KOOS-Child)
| Mean (range) | Baseline (t0) Ceiling/floor effects a (%) | Internal consistency b (CI) | Mean (range) | Follow-up (t1) Ceiling/floor effects a (%) | Internal consistency b (CI) | Test–retest reliability c (CI) | |
|---|---|---|---|---|---|---|---|
| BPII 2.0 | |||||||
| Participants d | n = 55 | n = 55 | |||||
| Average total score | 67 (14–98) | 0/0 | 0.96 (0.95–0.97) | 67 (14–98) | 0/0 | 0.97 (0.95–0.98) | 0.97 (0.96–0.98) |
| Subscales | |||||||
| Symptoms and physical complaints | 72 (0–100) | 1.8/1.8 | 0.85 (0.78–0.91) | 73 (14–100) | 5.5/0 | 0.88 (0.82–0.92) | 0.93 (0.87–0.96) |
| Work- and/or school-related concerns | 76 (31–100) | 11/0 | 0.71 (0.56–0.82) | 73 (16–100) | 11/0 | 0.79 (0.68–0.87) | 0.94 (0.90–0.97) |
| Recreation/sport/activity | 58 (3–99) | 0/0 | 0.92 (0.88–0.95) | 59 (3–100) | 3.6/0 | 0.91 (0.86–0.94) | 0.96 (0.93–0.98) |
| Lifestyle | 72 (4–100) | 11/0 | 0.90 (0.85–0.93) | 73 (4–100) | 3.6/0 | 0.91 (0.86–0.94) | 0.95 (0.92–0.97) |
| Social and emotional | 57 (0–97) | 0/1.8 | 0.86 (0.78–0.91) | 59 (0–100) | 1.8/1.8 | 0.90 (0.85–0.94) | 0.94 (0.90–0.97) |
| KOOS-Child | |||||||
| Participants d | n = 54 | n = 54 | |||||
| Subscales | |||||||
| Symptoms | 86 (57–100) | 20/0 | 0.60 (0.40–0.74) | 86 (57–100) | 22/0 | 0.68 (0.53–0.80) | 0.86 (0.77–0.92) |
| Pain | 84 (31–100) | 13/0 | 0.88 (0.82–0.92) | 85 (31–100) | 19/0 | 0.88 (0.83–0.93) | 0.94 (0.90–0.97) |
| ADL | 93 (50–100) | 48/0 | 0.90 (0.85–0.93) | 93 (50–100) | 46/0 | 0.90 (0.86–0.94) | 0.93 (0.89–0.96) |
| Sport/Play | 69 (0–100) | 9.3/3.7 | 0.94 (0.92–0.96) | 69 (0–100) | 9.3/1.9 | 0.95 (0.92–0.97) | 0.98 (0.96–0.99) |
| QoL | 63 (4–100) | 1.9/0 | 0.90 (0.85–0.94) | 62 (4–100) | 1.9/0 | 0.89 (0.84–0.93) | 0.92 (0.86–0.95) |
t0 = first questionnaire at baseline.
t1 = second questionnaire, on average 9 (5–22) days later.
a
> 15% maximum–minimum values, respectively.
b
ICC = intraclass correlation coefficient 2-way, random, consistency model.
c
ICC = intraclass correlation coefficient 2-way, random, single measures with absolute agreement.
d
Patients with follow-up at t1.
ADL = difficulty during daily activities; CI = 95% confidence interval; QoL = knee-related quality of life.