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The correlation coefficient between the total scale and the optimism subscale was 0.825, while the correlation between the total scale and the pessimism subscale was −0.803.
The strongest single correlation was a positive one and found between the total scale of MHC-SF and the total scale of MMQL (0.642).
As external point of reference, the correlation coefficient between the total scale and the VAS assessing the global strain during the index-intervention as perceived by staff-members was determined.
The Spearman's correlations between the total scale and the subscales were all quite high at.89,.93 and.87 for re-experiencing, avoidance and hyperarousal respectively; re-experiencing correlated.74 and.67 with avoidance and hyperarousal; and the correlation between avoidance and hyperarousal was.72.72
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For three instruments the correlations between items and the total scale ranged between 0.24 and 0.71, 0.37 and 0.80, and 0.56 and 0.64.
The subscales showed the intercorrelations displayed in table 4. *** p <.001 ** p <.01 * p <.05 To assess the construct validity, correlation coefficients between the subscales, the total scale, a VAS scale measuring strain, a PTSD screening, the Rosenberg-self-esteem-scale, patient satisfaction and the IES-R were calculated.
Although four of the five measures that examined test-retest reliability administered a second survey within 2-14 days [ 33, 35, 38, 53], none of the measures demonstrated acceptable agreement between scores for the total scale, subscales and items across the two administrations [ 18, 19].
The correlations between each dimension and the total scale were significantly different (table 5).
aItem-total correlations (corrected for overlaps) for the relation between each item and the total scale score.
The highest correlation was 0.65 between Feedback & Communication about Errors and the scale (r = 0.65), and the correlation between each dimension and the total scale is significantly different (Table 6).
According to ωH, the general factor accounted for as much as 65% of the common variance between all 66 items of the total scale.
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