Table 1 Mean scores and percent missing for the individual WOMAC items
| Â | Entire Cohort (N = 2062) | |
|---|---|---|
| Â | Mean Score (SD) | % Missing |
Pain Questions: | Â | Â |
   Walking on a flat surface | 2.0 (0.9) | 3.9 |
   Going up or down stairs | 2.3 (0.9) | 4.4 |
   At night while in bed | 1.8 (1.0) | 3.5 |
   Sitting or lying | 1.5 (1.0) | 3.9 |
   While Standing | 1.7 (0.9) | 3.8 |
Stiffness Questions: | Â | Â |
   How severe is your knee joint stiffness after first wakening in the morning? | 2.1 (1.0) | 3.4 |
   How severe is your knee stiffness after sitting, lying or resting later in the day? | 2.1 (0.9) | 2.9 |
Difficulty in Function Questions: | Â | Â |
   Descending stairs | 1.8 (1.0) | 4.7 |
   Ascending stairs | 2.1 (1.0) | 4.1 |
   Rising from sitting | 2.0 (0.9) | 3.2 |
   Standing | 1.7 (0.9) | 4.0 |
   Bending to the floor/pick up an object | 2.2 (1.0) | 3.7 |
   Walking on a flat surface | 1.8 (0.9) | 3.8 |
   Getting in/out of car | 2.3 (0.9) | 3.7 |
   Going shopping | 2.0 (0.9) | 6.5 |
   Putting on socks/stockings | 2.4 (1.0) | 4.1 |
   Rising from bed | 1.9 (1.0) | 3.4 |
   Taking off socks/stockings | 2.2 (1.0) | 4.6 |
   Lying in bed (turning over, maintaining hip position) | 2.0 (1.0) | 3.3 |
   Getting in/out of bath | 1.7 (1.0) | 12.3 |
   Sitting | 1.4 (0.9) | 3.8 |
   Getting on/off toilet | 1.7 (1.0) | 3.3 |
   Heavy domestic duties (moving heavy boxes, scrubbing floors etc.) | 2.6 (1.0) | 14.5 |
   Light domestic duties (cooking, dusting etc.) | 1.6 (0.9) | 7.1 |