Content validity and reliability of the modified Japanese version of the Healthcare Providers Patient-Activation Scale: self-reported adherence to patient-centered physical therapy scale.

BACKGROUND

Modifications to the Healthcare Providers Patient-Activation Scale (HP-PAS), which evaluates attitudes toward the importance of using a patient-centered approach (PCA), are required.

PURPOSE

Content validity and reliabilities of a scale developed from the HP-PAS to evaluate self-reported adherence to patient-centered physical therapy were preliminarily investigated.

METHODS

A total of 86 Japanese physical therapists completed the validity assessments in an anonymous survey. Among them, 53 completed the reliability assessments in a named survey. The HP-PAS was modified to mark the most suitable frequency for each item, creating an 11-point scale. For the validity assessments, the participants assigned each item to a therapist-centered approach or PCA using a 5-point scale. Content validity was considered when the proportion of scores 4 and 5 ("possibly" or "definitely" a PCA) with respect to the total number of scores was > 50%. Ceiling and flooring effects were considered when the response proportions of scores of 10 and 0, respectively, on an 11-point scale were > 20%. Items with an intraclass correlation coefficient (ICC) < 0.4 in the test-retest reliability from the item list were excluded.

RESULTS

Of the 20 items, 6 were excluded, developing a 14-item self-reported adherence to a patient-centered physical therapy scale (SAPCPTS), which exhibited good internal consistency (Cronbach's = 0.95, 95% confident intervals [CIs] = 0.93-0.96) and test-retest reliability (ICC = 0.84, 95% CIs = 0.75-0.91).

CONCLUSION

This study identified that the 14-item SAPCPTS demonstrated preliminary evidence of content validity and reliability.