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Table 1 Mean scores and percent missing for the individual WOMAC items

From: Is there a role for expectation maximization imputation in addressing missing data in research using WOMAC questionnaire? Comparison to the standard mean approach and a tutorial

  Entire Cohort (N = 2062)
  Mean Score (SD) % Missing
Pain Questions:   
   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:   
   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:   
   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
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