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