Advertisement
Table 5 Factor structure of the SF-12 derived from principal component analysis*
| Factor 1 | Factor 2 | |
|---|---|---|
| Physical functioning (PF) | ||
| Limitations in moderate physical activities (PF1) | 0.75 | 0.07 |
| Limitations in climbing several flights of stairs (PF2) | 0.74 | 0.10 |
| Role physical (RP) | ||
| Accomplished less due to physical health (RP1) | 0.67 | 0.26 |
| Limited in kind of work or activities due to physical health (RP2) | 0.72 | 0.23 |
| Bodily pain (BP) | ||
| Pain interference with work inside or outside home (PB1) | 0.48 | 0.30 |
| General health (GH) | ||
| Health rating in general (GH1) | 0.51 | 0.34 |
| Social functioning (SF) | ||
| Interference of physical health or e-motional problems with social activities (SF1) | 0.38 | 0.60 |
| RE | ||
| Accomplished less due to emotional problems (RE1) | 0.27 | 0.61 |
| Not careful in work or activities due to emotional problems (RE2) | 0.32 | 0.60 |
| Vitality (VT) | ||
| Having a lot of energy (VT1) | 0.22 | 0.61 |
| MH | ||
| Feel calm and peaceful (MH1) | 0.07 | 0.70 |
| Feel down hearted and blue (MH2) | 0.05 | 0.71 |
| Eigenvalues | 4.52 | 1.27 |
| Variance explained (%) | 37.7 | 20.1 |
