| Univariate | Multivariate |
---|---|---|
 | Mean WOMAC score (95%CI) | Mean WOMAC score (95%CI) |
Age groups: | Â | Â |
   < 50 | 56.8 (53.8, 59.8) | 58.4 (54.7, 62.1) |
   50–69 | 58.2 (57.0, 59.4) | 57.5 (56.0, 59.0) |
   70+ (reference) | 61.0 (59.5, 62.5) | 61.0 (59.2, 62.8) |
P for trend | 0.002 | 0.18 |
P for nonlinear trend | 0.51 | 0.04 |
Sex: | Â | Â |
   Male (reference) | 56.1 (54.7, 57.4) | 55.7 (54.1, 57.3) |
   Female | 61.5 (60.3, 62.7) | 61.6 (60.1, 63.1) |
Obesity: | Â | Â |
   Not obese (reference) | 58.2 (57.1, 59.2) | 57.5 (56.2, 58.8) |
   Obese | 62.9 (61.0, 64.8) | 62.5 (60.2, 64.7) |
   Morbidly Obese | 69.6 (61.0, 78.1) | 67.2 (57.6, 76.7) |
P for trend | < 0.001 | 0.028 |
P for nonlinear trend | 0.68 | 0.81 |
Employment status: | Â | Â |
   Employed | 55.9 (54.1, 57.7) | 56.7 (54.6, 58.9) |
   Retired (reference) | 59.6 (58.4, 60.8) | 58.8 (57.3, 60.2) |
   Retired Early | 65.9 (62.8, 69.0) | 65.3 (61.5, 69.1) |
   Other | 59.8 (56.9, 62.8) | 59.6 (55.9, 63.3) |
Qualifications after leaving school: | Â | Â |
   Postgraduate degree (reference) | 49.3 (44.9, 53.7) | 48.9 (43.3, 54.6) |
   University degree | 54.0 (51.4, 56.6) | 53.8 (50.8, 56.7) |
   College diploma, or equivalent | 56.4 (54.8, 58.1) | 56.9 (54.9, 58.9) |
   None | 62.1 (60.8, 63.4) | 62.2 (60.7, 63.8) |
P for trend | < 0.001 | < 0.001 |
P for nonlinear trend | 0.31 | 0.96 |
ASA status: | Â | Â |
   1 | 55.5 (53.3, 57.7) | 53.2 (50.5, 55.9) |
   2 (reference) | 58.7 (57.5, 59.9) | 58.4 (57.0, 59.8) |
   3 | 65.6 (63.4, 67.7) | 64.6 (62.2, 67.1) |
   4 | 59.3 (48.3, 70.3) | 54.7 (40.3, 69.0) |
P for trend | < 0.001 | < 0.001 |
P for nonlinear trend | 0.042 | 0.06 |
Kellgren & Lawrence Grade: | Â | Â |
   0 | 60.1 (47.4, 72.8) | 53.6 (37.0, 70.1) |
   1 | 70.7 (56.7, 84.6) | 77.1 (60.6, 93.7) |
   2 | 55.7 (50.2, 61.2) | 55.4 (49.4, 61.4) |
   3 | 58.0 (56.5, 59.4) | 58.4 (56.8, 60.0) |
   4 (reference) | 59.9 (58.5, 61.4) | 59.4 (57.8, 61.0) |
P for trend | 0.16 | 0.66 |
P for nonlinear trend | 0.12 | 0.14 |