Reliability and Validity of a Perinatal Shared Decision-Making Measure: The Childbirth Options, Information, and Person-Centered Explanation.

OBJECTIVE

To develop and test the psychometric properties of a shared decision-making tool: Childbirth Options, Information, and Person-Centered Explanation (CHOICEs).

DESIGN

Multiphase instrument development study beginning with item development through a cross-sectional postpartum survey.

SETTING

The cross-sectional postpartum survey was distributed online through convenience and snowball sampling methods.

METHODS

We developed instrument items through an iterative process with key stakeholders. We evaluated reliability based on internal consistency and differential item functioning analysis. We evaluated validity on evidence of construct validity. We used criterion-related item mapping to evaluate whether the measure addressed the full spectrum of shared decision making related to maternity care.

RESULTS

Surveys were completed by 1,171 participants. A Cronbach's α coefficient of .99 supported internal consistency reliability. Infit and outfit statistics that ranged from 0.92 to 1.55 supported item fit. Differential item functioning analysis showed that CHOICEs scores were invariant between different demographic groups. Significant positive correlations between scores on CHOICEs and the Mothers on Respect index (r = 0.75, p = .01) and the Mothers Autonomy in Decision-Making scale (r = 0.75, p = .01) supported criterion-related validity. Item mapping suggested more items were needed to capture the full spectrum of shared decision making.

CONCLUSION

We recommend using CHOICEs to evaluate shared decision making in maternity care for research and quality improvement projects.