Table 6

Association of disability (SF-36 function score <90) with anxiety, depression, voluntary quadriceps strength (MVC), quadriceps activation, and radiographic score in subjects without pain. Odds ratios have been calculated using logistic regression and are adjusted for age, sex, and BMI in addition to the variables shown. For bilateral variables, the worst value from either limb has been used in analysis

DisabilityOdds ratio95% Confidence intervals
yes (%)no (%)
Anxiety
<872 (46.5)83 (53.5)1
 ⩾835 (62.5)21 (37.5)2.040.95, 4.36
Depression
<897 (48.5)101 (51.5)1 6-150
 ⩾810 (90.9)1 (9.1)8.270.91, 83.94
MVC (kgF)
>406 (24.0)19 (76.0)1
 30–4019 (43.2)25 (56.8)3.040.86, 10.71
 20–3046 (54.8)38 (45.2)3.771.02, 13.91
 ⩽2036 (62.1)22 (37.9)4.981.08, 22.97
Activation (%)
>9038 (40.4)56 (59.6)1
 71–9046 (57.5)34 (42.5)1.570.76, 3.24
 ⩽7023 (62.2)14 (37.8)1.400.51, 3.80
Radiographic score
0–144 (48.9)46 (51.1)1
 2–332 (43.2)42 (56.8)0.520.24, 1.10
 ⩾431 (66.0)16 (34.0)0.900.37, 2.22
  • 6-150 Denotes a significant trend test (p<0.05).