Patient and physician shared decision-making behaviors in oncology: Evidence on adequate measurement properties of the iSHARE questionnaires

• Published in: Patient education and counseling Vol. 105; no. 5; pp. 1089 - 1100
• Main Authors: Bomhof-Roordink, Hanna, Stiggelbout, Anne M., Gärtner, Fania R., Portielje, Johanneke E.A., de Kroon, Cor D., Peeters, Koen C.M.J., Neelis, Karen J., Dekker, Jan Willem T., van der Weijden, Trudy, Pieterse, Arwen H., de Boer, Stephanie M., Boersma, Liesbeth J., ten Bokkel Huinink, Daan, Buijsen, Jeroen, Cloos-van Balen, Marissa, Gelderblom, Hans, van Leeuwen-Snoeks, Lobke, Lips, Irene M., Ramai, S. Rajen S., Roshani, Hossain, Slingerland, Marije, Vanneste, Ben G.L., Wiltink, Lisette M.
• Format: Journal Article
• Language: English
• Published: Ireland Elsevier B.V 01-05-2022
• Subjects: Construct validity; Formative; Hypotheses testing; Inter-rater agreement; Oncology; Questionnaire; Shared decision-making; Test-retest agreement; Construct validity; Questionnaire; Hypotheses testing; Oncology; Test-retest agreement; Inter-rater agreement; Formative; Shared decision-making
• ISSN: 0738-3991; 1873-5134
• DOI: 10.1016/j.pec.2021.08.034

•The iSHARE questionnaires assess patient and physician behaviors in the SDM process.•The iSHARE questionnaires demonstrate good construct validity.•The iSHAREpatient demonstrates substantial test-retest agreement.•The iSHARE questionnaires demonstrate moderate inter-rater agreement.•The iSHARE questionnaires are fit to evaluate patient and physician SDM interventions.
We have developed two Dutch questionnaires to assess the shared decision-making (SDM) process in oncology; the iSHAREpatient and iSHAREphysician. In this study, we aimed to determine: scores, construct validity, test-retest agreement (iSHAREpatient), and inter-rater (iSHAREpatient-iSHAREphysician) agreement.
Physicians from seven Dutch hospitals recruited cancer patients, and completed the iSHAREphysician and SDM-Questionnaire-physician version. Their patients completed the: iSHAREpatient, nine-item SDM-Questionnaire, Decisional Conflict Scale, Combined Outcome Measure for Risk communication And treatment Decision-making Effectiveness, and five-item Perceived Efficacy in Patient-Physician Interactions. We formulated, respectively, one (iSHAREphysician) and 10 (iSHAREpatient) a priori hypotheses regarding correlations between the iSHARE questionnaires and questionnaires assessing related constructs. To assess test-retest agreement patients completed the iSHAREpatient again 1–2 weeks later.
In total, 151 treatment decision-making processes with unique patients were rated. Dimension and total iSHARE scores were high both in patients and physicians. The hypothesis on the iSHAREphysician and 9/10 hypotheses on the iSHAREpatient were confirmed. Test-retest and inter-rater agreement were>.60 for most items.
The iSHARE questionnaires show high scores, have good construct validity, substantial test-retest agreement, and moderate inter-rater agreement.
Results from the iSHARE questionnaires can inform both physician- and patient-directed efforts to improve SDM in clinical practice.