To evaluate psychometric properties of a widely used patient experience survey.
English‐language responses to the Clinician & Group Consumer Assessment of Healthcare Providers and Systems () survey ( = 12,244) from a 2008 quality improvement initiative involving eight southern California medical groups.
We used an iterative hybrid ordinal logistic regression/item response theory differential item functioning () algorithm to identify items with related to patient sociodemographic characteristics, duration of the physician–patient relationship, number of physician visits, and self‐rated physical and mental health. We accounted for all sources of and determined its cumulative impact.
The upper end of the performance range is measured with low precision. With sensitive settings, some items were found to have . However, overall impact was negligible, as 0.14 percent of participants had salient impact. Latinos who spoke predominantly English at home had the highest prevalence of salient impact at 0.26 percent.
The functions similarly across commercially insured respondents from diverse backgrounds. Consequently, previously documented racial and ethnic group differences likely reflect true differences rather than measurement bias. The impact of low precision at the upper end of the scale should be clarified.
