RESUMEN
Background and Purpose: Team-based care has been proposed as a means of improving maternity care in the United States. Methods: The study evaluated the individual and group-level psychometric properties of the Collaborative Practice Scale (CPS) among 108 midwives and physicians who provided team-based care in military hospitals. Results: Psychometric properties of the CPS included Cronbach's alpha of .98. Internal consistency was measured with item-to-total correlations from .83 to .94 and inter-item correlations from .71 to .88. Principal components analysis resulted in a single-factor loading, accounting for 80% of total variance. Properties of the scale at the group level; strong within team agreement (r wg( j ) = .94) and between team variance (ICC1 = .15, ICC2 = .65). Conclusion: The CPS demonstrated reliability and validity of the instrument at the individual and group levels. The collaborative process can be measured among midwife-physician teams.