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Table 3 Suitability indices of construct validity and external validity according to the cognitive status: a global approach

From: Quantification of relevance of quality of life assessment for patients with cognitive impairment: the suitability indices

  MS SCZ
Construct validity LI 50 HI 49 LI 40 HI 67
% of identified factors 77.8 88.9 100 100
% of well-projected items 87.1 93.6 88.9 88.9
% of dimensions with IIC non exceeded 0.2 from ref 77.8 94.4 37.5 37.5
% of dimensions with IDV non exceeded 0.2 from ref 55.6 61.1 37.5 100
% of dimensions with IDV < IIC 66.7 77.8 62.5 62.5
% of dimensions with Cronbach’s alpha coefficients > =0.7 or > =ref 66.7 100 87.5 75.0
% of dimensions with INFIT ranged [0.7-1.3] 88.9 83.3 100 100
% of dimensions with MV < 10% from ref 100 100 100 100
% of dimensions with Floor < 10% from ref 88.9 44.4 75.0 75.0
% of dimensions with Ceiling < 10% from ref 66.7 77.8 50.0 62.5
External validity LI 50 HI 49 LI 40 HI 67
Age: % of dimensions with correlation coefficient < 0.40 100 100 100 100
Disease severity: % of dimensions meeting conditions* 100 88.9 75.0 100
Disease duration: % of dimensions with correlation coefficient < 0.40 100 100 100 100
Gender: % of dimensions with ES < 0.2 from ref 55.6 88.9 75.0 62.5
Educational level: % of dimensions with ES < 0.2 from ref 44.4 55.6 75.0 75.0
  1. MS multiple sclerosis, SCZ schizophrenia.
  2. *MusiQoL and EDSS, the two conditions were: i) correlation coefficient between ADL and EDSS > 0.4 and stronger than the other correlations for MusiQoL; ii) all other correlation coefficients inferior to 0.40. SQoL and PANSS, the condition was correlation coefficient < 0.30 or not statistically significant. The score was 100% when all the dimensions met the condition.
  3. LI no/low-impaired (0 or 1 impaired composites: executive. memory. and attention functions). HI highly-impaired (2 or 3 composites are impaired).