The basic psychological need support in physical therapy questionnaire.

Given the limitations of current inventories of basic psychological need measurement, and the importance of psychological need support within an injury rehabilitation context, there is an evident need to develop the present inventory. Utilizing Self-Determination Theory (SDT) as a theoretical framework, two studies were conducted to develop and psychometrically test a measure of patients' perceptions of basic psychological needs support in physical therapy: The Basic Psychological Needs Support in Physical Therapy Questionnaire (BPNS-PT). In study 1, a panel of Self-Determination Theory academics assessed a pool of items for content relevance, representativeness, and item clarity. In study 2, responses from 199 physical therapy patients were used to identify the best fitting model through confirmatory factor analysis. A 3-factor 10-item measure displayed good fit to the data and illustrated evidence of internal consistency. Findings from these studies provide initial psychometric support (i.e. internal consistency and evidence of construct validity) for the BPNSPT as a measure of patient perceptions of basic psychological needs support in a physical therapy context.