Construct validity was supported by item-total correlations where all items in the symptom scale were sufficiently correlated (≥0.3).
Staying active during an episode of back pain was supported by 80% (item 27); however, 69% also thought they should take it easy (item 21), 55% thought the risks of vigorous exercise outweighed the benefits (26% unsure; item 26) and 25% believed exercise should be avoided (item 25).
Construct validity was supported by comparing item scores of the LORQv3 among patient groups consisting of patients with maxillectomy and nasopharyngeal cancer without any maxillary defects.
The homogeneity of item content for the SIQ/SIQ-JR was supported by good item-total correlations, with all correlations higher than 0.5 and median item-total correlations higher than 0.7 in the overall, male, and female samples.
The distinct factor structure of WE-CARE has been supported by the item-discriminant validity tests in which constituent items were more correlated with their own domains than with any other domains.
Additionally, none of the items showed DIF and local independence of the items was supported by low inter-item residual correlations (<0.49).
Construct validity was supported by that the items of KDS-Yin and the items of KDS-Yang measured what they were supposed to measure.
Construct validity was supported by the sufficient item-total correlations where all except one reached the more stringent criteria suggested for final testing of scales (>0.4) [ 32].
