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Table 3 Summary of results of multitrait/multi-item scaling tests of the Swedish VascuQoL questionaire

From: Psychometric properties of the disease-specific health-related quality of life instrument VascuQoL in a Swedish setting

Multitrait/multi-item scaling tests
  Item-scale convergent validity Item-scale discriminant validity Scaling fulfillment
  Range of r Criterion 1 Range of r Criterion 2  
Scale Item-scale correlations a % of item scale correlations ≥ 0.40 b Correlation with other scales c Number of items higher Number of items that meet both criteria 1 and 2 e
Activity 0.25–0.71 88 0.04–0.70 7/8 7/8
Pain 0.51–0.66 100 0.38–0.66 2/4 2/4
Emotional 0.59–0.76 100 0.42–0.64 5/7 5/7
Social 0.55–0.55 100 0.48–0.70 0/2 0/2
Symptom 0.3–0.55 50 0.29–0.63 0/4 0/4
  1. aPearson correlations between items and hypothesized scale (corrected for overlap).
  2. bNumber of item-scale correlations that meet the minimum standard for convergent validity (r ≥ 0.40)/total numbers of correlations.
  3. cPearson correlations between items and competing scales.
  4. dCorrelations higher between items and hypothesized scale in comparison with all other scales.
  5. eItems in each scale that meet criteria for both item-scale convergent (Criterion1) and discriminant (Criterion 2) validity.