Table 2:
Item–scale correlation matrix for the eight SF-12v2 scales and summary measures†
| PF | RP | BP | GH | SF | RE | VT | MH | PCS | MCS | |
|---|---|---|---|---|---|---|---|---|---|---|
| PF | ||||||||||
| PF1 | 0.97 | 0.78 | 0.45 | 0.45 | 0.67 | 0.47 | 0.58 | 0.31 | 0.87 | 0.30 |
| PF2 | 0.96 | 0.75 | 0.43 | 0.44 | 0.62 | 0.44 | 0.52 | 0.26 | 0.86 | 0.24 |
| RP | ||||||||||
| RP1 | 0.77 | 0.98 | 0.46 | 0.54 | 0.73 | 0.61 | 0.61 | 0.38 | 0.82 | 0.46 |
| RP2 | 0.78 | 0.98 | 0.46 | 0.54 | 0.72 | 0.58 | 0.60 | 0.35 | 0.83 | 0.43 |
| BP | 0.45 | 0.47 | 1.00 | 0.41 | 0.43 | 0.39 | 0.43 | 0.32 | 0.65 | 0.29 |
| GH | 0.46 | 0.55 | 0.41 | 1.00 | 0.50 | 0.47 | 0.55 | 0.40 | 0.62 | 0.46 |
| SF | 0.67 | 0.74 | 0.43 | 0.50 | 1.00 | 0.56 | 0.65 | 0.45 | 0.66 | 0.62 |
| RE | ||||||||||
| RE1 | 0.47 | 0.60 | 0.37 | 0.45 | 0.56 | 0.96 | 0.45 | 0.61 | 0.38 | 0.78 |
| RE2 | 0.45 | 0.57 | 0.37 | 0.46 | 0.53 | 0.97 | 0.44 | 0.60 | 0.36 | 0.78 |
| VT | 0.57 | 0.62 | 0.43 | 0.55 | 0.65 | 0.46 | 1.00 | 0.49 | 0.60 | 0.63 |
| MH | ||||||||||
| MH1 | 0.23 | 0.28 | 0.27 | 0.32 | 0.32 | 0.48 | 0.45 | 0.87 | 0.12 | 0.71 |
| MH2 | 0.33 | 0.41 | 0.32 | 0.41 | 0.51 | 0.66 | 0.46 | 0.89 | 0.22 | 0.82 |
†
Figures are Spearman’s correlation coefficient (rho).
Higher correlations of each item with a SF-12v2 domain or component are indicated in bold.
All correlations were significant at P≤0.01. Correlation values of 0.40 or above were considered satisfactory.
SF-12v2: Short Form-12 Health Survey Version 2; MCS: Mental Component Summary; PCS: Physical Component Summary; PF: Physical Functioning; RP: Role Physical; BP: Bodily Pain; GH: General Health; VT: Vitality; SF: Social Functioning; RE: Role Emotional; MH: Mental Health