Table 3 |
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|
Multinomial regression function: 'any OA' |
|||
|
N |
666 |
||
|
Missing |
49 |
||
|
|
|||
|
NONE |
ISO-PF |
COMB |
|
|
n = 212 |
n = 170 |
n = 284 |
|
|
aOR (95% CI)* |
aOR (95% CI)* |
||
|
|
|||
|
Age (per year) |
0.96 (0.93, 0.99) |
1 |
1.04 (1.01, 1.07) |
|
Female gender |
2.87 (1.79, 4.59) |
1 |
1.56 (0.99, 2.47) |
|
BMI (per kg/m2) |
0.94 (0.89, 0.99) |
1 |
1.04 (0.99, 1.09) |
|
Whole leg pain |
2.12 (1.10, 4.08) |
1 |
0.74 (0.37, 1.50) |
|
Difficulty descending stairs |
0.45 (0.27, 0.73) |
1 |
1.15 (0.74, 1.80) |
|
Intercondylar gap > 0 cm |
1.38 (0.75, 2.57) |
1 |
2.34 (1.32, 4.14) |
|
Knee effusion† |
0.82 (0.49, 1.35) |
1 |
2.42 (1.55, 3.77) |
|
Fixed flexion deformity |
0.20 (0.04, 0.93) |
1 |
2.31 (1.13, 4.77) |
|
Coarse crepitus‡ |
0.64 (0.40, 1.02) |
1 |
1.57 (1.03, 2.41) |
|
Knee flexion ROM (per degree) |
0.99 (0.96, 1.01) |
1 |
0.96 (0.94, 0.98) |
|
|
|||
|
Nagelkerke's Pseudo R2 |
0.41 |
||
|
Pearson goodness-of-fit |
P = 0.45 |
||
|
Pre-test probability |
0.32 |
0.26 |
0.43 |
|
|
|||
|
Correctly classified on 'balance of probabilities' |
136 (64%) |
36 (21%) |
220 (77%) |
|
Correctly classified on 'confident diagnosis' (probability ≥0.8) |
18 (8%) |
0 |
79 (28%) |
|
|
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|
* odds ratio with 95% confidence interval, adjusted for all other covariates in model. aOR is interpreted as the odds relative to the ISO-PF group (for example, compared to those people with ISO-PF, people with COMB have 2.4 times the odds of having knee effusion; compared with ISO-PF, those with no ROA have 0.45 times the odds of difficulty descending stairs, that is, lower risk). †Mild/Moderate/Gross ‡Possible/definite |
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|
Peat et al. Arthritis Research & Therapy 2012 14:R63 doi:10.1186/ar3779 |
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