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Table 2 Tests of scaling assumptions

From: Thai SF-36 health survey: tests of data quality, scaling assumptions, reliability and validity in healthy men and women

Scale # items per scale, k (a) Item internal consistency (b) Item discriminant validity
   Rangea Comparisonb Success rate (%) Rangec Comparisond Success rate (%)
PF 10 0.48 – 0.68 10/10 100 0.10 – 0.31 70/70 100
RP 4 0.65 – 0.77 4/4 100 0.18 – 0.44 28/28 100
BP 2 0.83 2/2 100 0.22 – 0.46 14/14 100
GH 5 0.60 – 0.79 5/5 100 0.14 – 0.45 35/35 100
VT 4 0.64 – 0.75 4/4 100 0.16 – 0.59 28/28 100
SF 2 0.77 2/2 100 0.20 – 0.40 14/14 100
RE 3 0.67 – 0.84 3/3 100 0.18 – 0.44 21/21 100
MH 5 0.50 – 0.75 5/5 100 0.12 – 0.66 35/35 100
  1. a Correlations between items and hypothesized scale, corrected for overlap
  2. b Number of items out of k with correlation ≥ 0.40
  3. c Correlations between items and other scales
  4. d Number of items out of 7 × k where difference between the correlation of the item with its own scale and correlation with the other scales ≥ 2SE (= 0.0576)