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