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Table 2 Item description and descriptive statistics for the SF-12v2 component summary scores (n = 3685)

From: The 12-item medical outcomes study short form health survey version 2.0 (SF-12v2): a population-based validation study from Tehran, Iran

SF-12v2 item (scale) Mean row scores (SD) 95% CI Response frequencies (%)
    1 2 3 4 5
Limitations in moderate physical activities (PF) 2.33 (0.76) 2.31-2.36 18.2 30.4 51.3 - -
Limitations in climbing several flights of stairs (PF) 2.18 (0.80) 2.15-2.20 24.9 32.6 42.4 - -
Accomplished less due to physical health (RP) 3.41 (1.29) 3.37-3.45 8.4 19.0 23.6 21.3 27.7
Limited in kind of work or activities due to physical health (RP) 3.55 (1.26) 3.51-3.59 6.8 15.5 25.2 21.1 31.4
Pain interference with work inside or outside home (BP)** 2.53 (1.15) 2.49-2.56 23.1 27.5 26.9 18.5 4.0
Health rating in general (GH)** 3.34 (1.01) 3.31-3.38 6.2 10.8 36.7 35.4 11.0
Interference of physical health or emotional problems with social activities (SF) 3.50 (1.19) 3.46-3.54 5.8 15.6 27.5 25.0 26.1
Accomplished less due to emotional problems (RE) 3.53 (1.26) 3.49-3.57 6.8 16.8 23.2 23.2 30.0
Not careful in work or activities due to emotional problems (RE) 3.62 (1.19) 3.58-3.65 5.0 14.5 24.9 25.2 30.4
Having a lot of energy (VT)** 2.86 (1.19) 2.83-2.90 15.0 25.0 27.9 22.7 9.4
Feel calm and peaceful (MH)** 2.49 (1.21) 2.45-2.53 24.3 31.5 22.9 13.6 7.7
Feel downhearted and blue (MH) 3.48 (1.27) 3.44-3.52 8.5 16.0 21.5 27.1 26.9
Summary components PCS MCS      
Mean (SD)*** 42.3 (11.4) 44.6 (11.9)      
95% CI 41.9-42.6 44.2-45.0      
Cronbach's α 0.87 0.82      
Skewness -0.40 -0.35      
Minimum (% floor) 4.70 (0.0) 5.88 (0.0)      
Maximum (%ceiling) 73.6 (0.0) 77.1 (0.0)      
  1. * The format adapted from [4]
  2. ** Item recorded in order to make all response frequencies in the same direction. Now for all 12 items higher scores indicate better condition.
  3. *** Derived form Quality Metric Health Outcomes Scoring Software 2.