Comparison of the CollaboRATE and SDM-Q-9 questionnaires to appreciate the patient-reported level of shared decision-making.

Objective: To compare CollaboRATE and SDM-Q-9 questionnaires when appreciating patient-perceived level of shared decision-making (SDM) in doctor-patient consultations.

Methods: Data were harvested from five separate studies on SDM, conducted in three university and one large community hospital in the Netherlands, using Dutch versions of both questionnaires. CollaboRATE and SDM-Q-9 scores were expressed as percentages. Correlation was assessed using Spearman's Rho coefficient. Bland&Altman analysis was used to assess the degree of agreement. Top scores were calculated to assess possible ceiling effects.

Results: The five studies included 442 patients. Median CollaboRATE scores (88.9%, IQR 81.5-100%) were significantly higher (p < 0.001) than SDM-Q-9 scores (80.0%, IQR 64.4-100%). Correlation was moderate (Rho=0.53, p < 0.001). A systematic, 12.5-point higher score was found across the range of scores when using CollaboRATE. Top scores for CollaboRATE and SDM-Q-9 were present in 37.5% and 17% of questionnaires, respectively.

Conclusions: Overall, CollaboRATE and SDM-Q-9 questionnaires showed a high level of patient-perceived SDM. However, CollaboRATE only moderately correlated with SDM-Q-9 and had a stronger ceiling effect.

Practice Implications: When choosing a SDM-measurement tool, its benefits and limitations should be weighed. These metrics should be combined with objective scores of SDM, as these may differ from the patients' subjective interpretation.