Table 4—

Internal consistency and reproducibility of the DDRQOL scale

SubscaleNumber of itemsMean ± SD*αICC
n236133
Satisfaction with diet468.0 ± 20.30.840.71
Burden of diet therapy866.7 ± 19.60.840.75
Perceived merits of diet therapy551.3 ± 21.20.760.70
General perception of diet151.8 ± 21.40.46
Restriction of social functions275.2 ± 21.50.710.59
Vitality462.5 ± 19.90.760.70
Mental health569.7 ± 18.60.800.67
  • *

    * All measures are scored from 0 to 100;

  • α, Cronbach’s α. ICC, intraclass correlation coefficient.