Development of a new tool: progression of paediatric powered mobility- 3PM.

Purpose: To develop a tool to assess the progression of powered mobility skills for children and determine its psychometric properties.

Method: A three-phase, the mixed-method design included: I) conceptualisation based on international specialists' input through a focus group or interview to generate initial items; II) tool development using a two-round Delphi survey and III) evaluation of psychometric properties from eight video recordings of children. The Progression of Paediatric Powered Mobility (3PM) was validated Intraclass correlation coefficients (ICC) calculated from conventionally powered mobility assessments: the Powered Mobility Program, the Assessment of Learning Powered Mobility tool, and the Powered Mobility Proficiency test.

Results: Content derived from 20 clinical experts led to the development of the first version consisting of 19 demographic and 61 driving skill items. Following two Delphi rounds, the final tool included 14 demographic and 41 driving skill items. Internal consistency was excellent (Cronbach alpha = 0.96) as was the inter-rater reliability (ICC = 0.96, 95% confidence interval = 0.95-0.96). Pearson correlation coefficients between the 3PM and other PM assessments demonstrated good convergent validity.

Conclusion: The 3PM, created through international collaboration with experts in PM, has excellent psychometric values as a valid measure that can be used reliably to assess children's powered mobility skills.Implications for rehabilitationThe 3PM reflects the three stages of powered mobility development: exploratory, operational, and functional stages.Input from clinical experts in PM mobility contributed to the identification of the key driving skills important to include in the 3PM.A reliable and valid tool can facilitate assessment and tailored intervention in paediatric powered mobility.