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Table 4 Multinomial diagnostic regression function: 'moderate to severe OA'

From: Clinical features of symptomatic patellofemoral joint osteoarthritis

N 688
Missing 57
  NONE/MILD ISO-PF ISO-TF COMB
  n = 415 n = 91 n = 114 n = 68
  aOR (95% CI)*   aOR (95% CI)* aOR (95% CI)*
Age (per year) 0.91 (0.88, 0.95) 1 0.99 (0.95, 1.03) 1.00 (0.96, 1.05)
Female gender 1.20 (0.66, 2.18) 1 1.18 (0.58, 2.39) 1.09 (0.49, 2.44)
BMI (per kg/m2) 0.94 (0.87, 1.00) 1 1.02 (0.95, 1.09) 1.04 (0.97, 1.12)
Dramatic swelling ever 0.36 (0.19, 0.69) 1 0.35 (0.16, 0.76) 0.95 (0.44, 2.07)
Difficulty descending stairs 0.60 (0.35, 1.05) 1 1.36 (0.70, 2.66) 1.41 (0.65, 3.07)
Intercondylar gap > 0 cm 1.53 (0.67, 3.51) 1 4.50 (1.87, 10.84) 1.62 (0.56, 4.68)
PFJ compression test† 0.52 (0.29, 0.92) 1 0.40 (0.20, 0.79) 0.22 (0.10, 0.48)
Knee effusion‡ 0.42 (0.25, 0.72) 1 1.21 (0.66, 2.25) 1.29 (0.63, 2.63)
Fixed flexion deformity 0.83 (0.31, 2.24) 1 2.68 (1.01, 7.08) 4.56 (1.67, 12.49)
Bony enlargement§ 1.13 (0.66, 1.95) 1 1.75 (0.92, 3.32) 2.59 (1.21, 5.53)
Reduced knee extensor strength¶ 0.38 (0.20, 0.69) 1 0.41 (0.20, 0.83) 0.68 (0.30, 1.56)
Coarse crepitus§ 0.37 (0.22, 0.63) 1 0.75 (0.40, 1.38) 0.82 (0.40, 1.69)
Knee flexion ROM (per degree) 0.99 (0.96, 1.02) 1 0.96 (0.93, 0.99) 0.95 (0.92, 0.98)
Nagelkerke's Pseudo R2 0.47
Pearson goodness-of-fit P = 1.00
Pre-test probability 0.60 0.14 0.16 0.10
Correctly classified on 'confident diagnosis' (probability ≥0.8) 222 (53%) 0 0 0
Correctly classified on 'balance of probabilities' 385 (93%) 23 (25%) 41 (36%) 18 (26%)
  1. * 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 with those people with ISO-PF, those with ISO-TF have 4.5 times the odds of intercondylar gap > 0 cm (varus deformity); compared with ISO-PF participants with NONE/MILD, ISO-TF, and COMB were less likely to report pain on patellofemoral joint compression). †Compression or glide pain. ‡Mild/Moderate/Gross. §Possible/Definite. ¶< 141mmHg