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Table 4 Item-scale correlation matrix for the eight SF-12 scales and summary measures*

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

  PF RP BP GH SF RE VT MH PCS MCS
PF           
PF1 0.84 0.42 0.25 0.37 0.31 0.25 0.26 0.23 0.62 0.17
PF2 0.85 0.44 0.24 0.36 0.32 0.26 0.29 0.24 0.61 0.20
RP           
RP1 0.42 0.89 0.27 0.34 0.36 0.43 0.25 0.24 0.62 0.30
RP2 0.44 0.87 0.29 0.34 0.38 0.40 0.24 0.25 0.65 0.29
BP           
BP1 0.28 0.32 1.00 0.27 0.34 0.25 0.22 0.22 0.58 0.23
GH           
GH1 0.42 0.38 0.27 1.00 0.36 0.30 0.35 0.31 0.61 0.35
SF           
SF1 0.36 0.41 0.34 0.36 1.00 0.43 0.35 0.45 0.36 0.66
RE           
RE1 0.25 0.41 0.21 0.27 0.37 0.91 0.25 0.33 0.12 0.70
RE2 0.29 0.42 0.24 0.28 0.40 0.89 0.26 0.34 0.17 0.67
VT           
VT1 0.32 0.28 0.22 0.35 0.35 0.28 1.00 0.48 0.35 0.53
MH           
MH1 0.24 0.23 0.18 0.27 0.34 0.27 0.49 0.82 0.15 0.61
MH2 0.19 0.21 0.16 0.25 0.40 0.34 0.28 0.78 0.05 0.68
  1. * Figures are Spearman's correlation coefficient (rho). All correlations were significant at the 0.01 levels. Correlation values of 0.40 or above were considered satisfactory (correlations ≥ 0.81-1.0 as excellent, 0.61-0.80 very good, 0.41-0.60 good, 0.21-0.40 fair, and 0-0.20 poor) [30].