Table 3.
Frequencies of focal knee lesions WORMS Max >1 (none, right only, left only, and bilateral) in knee pairs of subjects with no, right only, and bilateral knee pain. Frequencies are given in absolute numbers and on percentage basis.
| Subjects with right knee pain (n=30) | left WORMS Max ≤ 1 | left WORMS Max >1 | p-value * | Odds ratio (95% CI) for association of findings in right and left knees ** | |
|---|---|---|---|---|---|
|
|
|||||
| Meniscus | right WORMS Max ≤1 | 15 (50.0%) | 2 (6.7%) | 0.180 | 6.4 (1.0–40.3) |
| right WORMS Max >1 | 7 (23.3%) | 6 (20.0%) | |||
| Cartilage | right WORMS Max ≤1 | 6 (20.0%) | 2 (6.7%) | 0.109 | 5.3 (0.9–32.4) |
| right WORMS Max >1 | 8 (26.7%) | 14 (46.6%) | |||
|
|
|||||
| Subjects without knee pain (n=60) | |||||
| Meniscus | right WORMS Max ≤1 | 29 (48.3%) | 7 (11.7%) | 0.629 | 5.8 (1.8–18.5) |
| right WORMS Max >1 | 10 (16.7%) | 14 (23.3%) | |||
| Cartilage | right WORMS Max ≥1 | 20 (33.4%) | 8 (13.3%) | 1.000 | 7.5 (2.4–23.6) |
| right WORMS Max >1 | 8 (13.3%) | 24 (40.0%) | |||
|
|
|||||
| Subjects with bilateral knee pain (n=30) | |||||
| Meniscus | right WORMS Max ≤1 | 17 (56.6%) | 5 (16.7%) | 0.727 | 5.7 (0.9–32.4) |
| right WORMS Max >1 | 3 (10.0%) | 5 (16.7%) | |||
| Cartilage | right WORMS Max ≤1 | 7 (23.3%) | 5 (16.7%) | 0.453 | 11.2 (1.7–72.3) |
| right WORMS Max >1 | 2 (6.7%) | 16 (53.3%) | |||
*
P-values are calculated using McNemar’s test to evaluate whether the two marginal frequencies of imaging findings in knee pairs, i.e. the prevalence of right only and left only focal knee lesions, differ significantly.
**
Odds ratios and 95% confidence intervals (CI) express the association of prevalent focal knee lesions in the right and left knee.
P-values of McNemar’s test and odds ratios with statistical significance (p<0.05) are printed in bold.