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Initially, for comparison with earlier work, a confirmatory factor analysis on the total 22 items failed to support a total score (CFI = 0.894; TLI = 0.883; RMSEA 0.145).
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However, for this study, only the subscales concerning emotional support (Emotional/Informational Support, Positive Social Interaction, and Affectionate Support) were used to produce a total score for "perceived emotional support".
For perceived health benefits, perceived barriers, self-efficacy, social support and facility availability, a total score for each factor was computed by adding the responses on all items for each factor and then a mean score was obtained by dividing the total score by the number of items for each factor.
Internal consistency for the Adult PedsQL™ NF1 Module Total Score exceeded the minimum reliability criterion of 0.90 for individual patient analysis, which supports the use of a Total Score as a measure of HRQOL in NF1 adults and supports the use of this instrument to follow improvement or deterioration over time in individuals.
Factor analysis supports the use of a total score.
The exploratory factor analysis using principal axis factoring indicates the presence of essential unidimensionality, which, in turn, supports the use of a total score for the IDUQOL.
These results, in addition to a visual examination of the scree plot (see Figure 1) indicated an essentially unidimensional factor structure for the IDUQOL, which supported the use of a total score [ 32- 35].
The validity and uni-dimensional nature of the final 13-item SOBDA questionnaire was also demonstrated; it showed good overall Rasch model fit and captured SOB along a single measurement scale, thus supporting the use of a total score to represent SOB with daily activities.
There was support for the calculation of a total score for the questionnaire.
A total score of social support at work was obtained by adding the scores of co-worker support to those of supervisory support.
The z-scores of each item are summarized into a total score of social support.
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Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com