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Table 2 Item description and descriptive statistics for the SF-12 component summary scores (n = 5587)*

From: The Iranian version of 12-item Short Form Health Survey (SF-12): factor structure, internal consistency and construct validity

SF-12 items (scale) Mean row scores (SD) 95% CI Response frequencies (%)
    1 2 3 4 5 6
Limitations in moderate physical activities (PF) 2.66 (0.60) 2.65-2.68 7.0 19.6 73.4 - - -
Limitations in climbing several flights of stairs (PF) 2.65 (0.64) 2.63-2.67 9.7 15.7 74.6 - - -
Accomplished less due to physical health (RP) 1.70 (0.20) 1.69-1.72 29.6 70.4 - - - -
Limited in kind of work or activities due to physical health (RP) 1.72 (0.44) 1.71-1.74 27.6 72.4 - - - -
Pain interference with work inside or outside home (PB)** 4.29 (0.91) 4.27-4.32 2.0 3.6 8.6 34.5 51.4 -
Health rating in general (GH)** 3.15 (1.10) 3.12-3.18 4.4 26.1 34.4 19.8 15.2 -
Interference of physical health or emotional problems with social activities (SF) 3.92 (1.08) 3.89-3.95 2.8 7.9 22.4 28.5 38.4 -
Accomplished less due to emotional problems (RE) 1.64 (0.23) 1.63-1.66 35.7 64.3 - - - -
Not careful in work or activities due to emotional problems (RE) 1.67 (0.22) 1.66-1.68 32.8 67.2 - - - -
Having a lot of energy (VT)** 4.04 (1.38) 4.00-4.07 4.7 9.4 22.4 19.5 28.4 15.5
Feel calm and peaceful (MH)** 4.33 (1.35) 4.29-4.36 4.1 6.6 15.8 19.5 33.3 20.6
Feel downhearted and blue (MH) 4.39 (1.57) 4.36-4.43 3.2 6.5 7.6 33.9 28.1 20.7
Summary components PCS-12 MCS-12       
Mean (SD)*** 50.1 (8.5) 46.3 (10.4)       
95% CI 49.8-50.3 46.1-46.6       
Cronbach's α 0.73 0.72       
Skewness -0.98 -0.68       
Minimum (% floor) 14.74 (0.0) 9.17 (0.0)       
Maximum (% ceiling) 68.74 (0.0) 70.35 (0.0)       
  1. * The format adapted from [25].
  2. **Item recoded in order to make all response frequencies in the same direction. Now for all 12 items higher scores indicate better condition.
  3. *** Derived from QualityMetric Health Outcomes Scoring Software 2.