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Table 1 Quality criteria and thresholds of acceptability for measurement properties (adapted from Wilberforce et al., 2016)

From: How is patient involvement measured in patient centeredness scales for health professionals? A systematic review of their measurement properties and content

Measurement property

Rating

Threshold for acceptability

Internal consistency: overall scale

+

Cronbach alpha >.70 and < .95

 

–

Cronbach alpha <.70 and > .95

Internal consistency: sub-scales

+

Cronbach alpha >.70 and < .95

 

–

Cronbach alpha <.70 and > .95

Reliability

+

Intraclass Correlation Coefficient (ICC) > .70 OR Pearson’s Correlation Coefficient (r) > .80

 

–

ICC < .70 OR r < .80

Content validity

+

Assessed in target population that items are a complete representation of concept under measurement and that all items are relevant

 

–

Questionnaire is incomplete OR contains irrelevant items

Structural validity

+

Factors explain 50% of variance

 

–

Factors explain less than 50% of variance

Cross-cultural validity

+

Original factor structure confirmed OR no differential item functioning

 

–

Original factor structure not confirmed OR important differential item functioning observed