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Table 4 Severity-specific algorithms for converting SF-36 data into AQoL scores

From: Can we derive an 'exchange rate' between descriptive and preference-based outcome measures for stroke? Results from the transfer to utility (TTU) technique

Model Predictor β SE t Sig.
SF-36 Subscale      
NIHSS = 0–5 (Constant) 0.0364 0.0423 0.86 0.390
  Physical Function (PF) 0.0074 0.0014 5.24 0.000
  Bodily Pain (BP) 0.0006 0.0004 1.81 0.072
  Social Function (SF) 0.0022 0.0007 3.12 0.002
  PF*PF -5.25*10-5 1.22*10-5 -4.29 0.000
  PF*Mental Health (MH) 2.90*10-5 1.36*10-5 2.13 0.034
  Vitality (VI)*VI -1.69*10-5 7.20*10-6 -2.35 0.019
  VI*Role Physical (RP) 3.79*10-5 9.47*10-6 4.00 0.000
  General Health (GH)*MH 2.49*10-5 8.61*10-6 2.89 0.004
  GH*RP -3.07*10-5 7.89*10-6 -3.89 0.000
  SF*MH -1.61*10-5 9.71*10-6 -1.66 0.097
  0.6346   F566,364 = 2.14 0.000
   Obs = 941 Ids = 567 F10,364 = 22.34 0.000
    R2 within = 0.38 R2 between = 0.69 R2 overall = 0.67
NIHSS ≥ 6 (Constant) 0.0744 0.0781 0.95 0.343
  BP*SF -2.23*10-5 7.60*10-6 -2.93 0.004
  PF 0.0081 0.0023 3.52 0.001
  RP -0.0030 0.0013 -2.29 0.024
  MH*MH -2.80*10-5 1.29*10-5 -2.17 0.032
  VI -0.0053 0.0031 -1.68 0.096
  SF*PF 7.89*10-5 2.41*10-5 3.27 0.002
  PF*PF -0.0001 1.49*10-5 -8.38 0.000
  PF*RP -7.79*10-5 1.86*10-5 -4.20 0.000
  MH*RP 6.49*10-5 2.82*10-5 2.30 0.000
  SF*SF 1.84*10-5 6.65*10-6 2.77 0.007
  VI*MH 8.90*10-5 4.27*10-5 2.09 0.040
  GH*MH 1.85*10-5 9.26*10-6 1.99 0.049
  - - - ns
   Obs = 117 Ids = 96 F12,95 = 35.12 0.000
      R2 overall = 0.50
SF-36 Item      
NIHSS = 0–5 (Constant) -0.2424 0.0757 -3.20 0.001
  Item 2 (general health change) -0.0408 0.0153 -2.67 0.008
  Item 3b (moderate activities) 0.0584 0.0156 3.74 0.000
  Item 3d (several flights stairs) 0.0321 0.0154 2.09 0.038
  Item 3h (walking 1/2 km) 0.0384 0.0159 2.42 0.016
  Item 3j (bathing/dressing) 0.0934 0.0175 5.35 0.000
  Item 4a (other activities) 0.0590 0.0215 2.74 0.006
  Item 4b (accomplished less) -0.0386 0.0220 -1.75 0.080
  Item 9b (nervous) 0.0195 0.0072 2.70 0.007
  Item 9f (felt down) 0.0159 0.0085 1.88 0.061
  Item 9i (tired) 0.0250 0.0069 3.60 0.000
  Item 10 (social activities, time) 0.0224 0.0068 -3.20 0.001
  0.6378   F567,363 = 2.05 0.000
   Obs = 942 Ids = 568 F11,363 = 20.68 0.000
    R2 within = 0.39 R2 between = 0.69 R2 overall = 0.67
NIHSS ≥ 6 (Constant) 0.0331 0.0427 0.77 0.441
  Item 3a (vigorous activities) -0.1897 0.0497 -3.82 0.000
  Item 3b (moderate activities) -0.2940 0.1393 -2.11 0.037
  Item 3d (several flights stairs) 0.1462 0.0623 2.35 0.021
  Item 3g (walking > 1 km) 0.2080 0.0828 2.51 0.014
  Item 3j (bathing/dressing) 0.0901 0.0251 3.58 0.001
  Item 6 (social activities, extent) -0.0139 0.0082 -1.69 0.094
  Item 9c (down in dumps) 0.0135 0.0068 1.99 0.050
  Item 11c (expect worse health) 0.0163 0.0066 2.46 0.016
  - - - ns
   Obs = 117 Ids = 96 F8,95 = 15.44 0.000
      R2 overall = 0.37