Evaluating cancer patients' experiences with doctor-patient communication in Taiwan: development and validation of a new assessment instrument.

Introduction: Effective communication between doctors and patients is crucial for the well-being of individuals diagnosed with cancer. This study aimed to develop and validate a cancer-specific Doctor-Patient Communication Satisfaction Scale (DPCSS-Cancer) from the patients' perspective.

Methods: Initial items were generated through literature review. Content validity was assessed via feedback from five experts, while face validity was determined through cognitive interviews with 13 patients. The revised DPCSS-Cancer was subsequently tested in a sample of 200 cancer patients to assess test-retest stability, internal consistency, factor structure, and criterion-related validity.

Results: The development process resulted in a 15-item DPCSS-Cancer across two dimensions, using a 4-point rating scale (1 = strongly disagree to 4 = strongly agree). The item-level Content Validity Index (I-CVI) ranged from 0.8 to 1.0, with a scale-level CVI of 0.96. Following expert and patient feedback, no items were eliminated, but modifications were made to item wording. In formal testing, the overall Cronbach's alpha was 0.96, with 0.89 for the first dimension and 0.95 for the second. Test-retest reliability was established at 0.82. The two-dimensional structure was partially confirmed. Criterion-related validity was supported through a significant positive correlation with a measure of trust in the physician (r = 0.86). Factors contributing to higher DPCSS-Cancer scores were identified.

Conclusion: The DPCSS-Cancer shows satisfactory reliability and validity, making it a viable patient-reported outcome measure for assessing cancer patients' satisfaction with doctor-patient communication.