ThyroidEx: Development and Preliminary Validation of a Thyroid Surgery Expectations Measure.

Abstract

To address the lack of validated patient-reported outcome (PRO) instruments that define and quantify patient expectations in thyroid cancer surgery, we developed and initially validated ThyroidEx, a novel disease-specific PRO instrument. Survey study. Single-institution tertiary care cancer center. An expert panel drafted an initial set of thyroid cancer-specific concepts, which was used in semistructured concept elicitation interviews with patients with thyroid cancer 4 weeks before and 8 weeks after surgery. Candidate items were generated per patient responses and refined via cognitive interviewing and additional review by the expert panel. The draft ThyroidEx was then preoperatively administered to a separate cohort undergoing thyroid cancer surgery to establish a final item set and initial psychometric evidence. Prospective concept elicitation interviews generated 358 patient-elicited concepts (n = 15 patients). These were then placed into 70 unique subcategories from which 41 items were generated for cognitive interviews with 20 patients preoperatively and 28 postoperatively. After expert panel review, ThyroidEx included 18 items across 2 scales (Expectations and Concerns), with an additional item about beliefs. In the preoperative cohort in phase 2 (n = 67), internal consistency Cronbach's α values ranged from 0.81 to 0.89. Descriptive analysis showed significant differences between patients' concerns and expectations and clinicians' perceptions. Defining expectations represents an important modifier in the measurement of PROs. Preliminary validation of ThyroidEx revealed incongruent expectations between expert opinion and patients. Future development and implementation of ThyroidEx may affect preoperative consultation and the consent process.