Objective: To examine sensitivity to change and responsiveness of the Community Balance and Mobility Scale (CBM) and shortened CBM (s-CBM). Design: Secondary analysis using data of a randomized controlled trial. Setting: General community. Participants: Young community-dwelling seniors aged 61-70 years (N=134; mean age, 66.2±2.5y). Interventions: Participants underwent 12 months of exercise intervention. Main Outcome Measures: CBM and s-CBM. Sensitivity to change was assessed using standardized response mean (SRM) and paired t tests as appropriate. Responsiveness was assessed using 2 minimal important difference (MID) estimates. Analyses were conducted for the full sample and for the subgroups “high-balance” and “low-balance,” divided by median split. Results: Inferential statistics revealed a significant CBM (P<.001) and s-CBM (P<.001) improvement within the full sample and the subgroups (high-balance: P=.001, P=.019; low-balance: P<.001, P<.001). CBM and s-CBM were moderately sensitive to change (SRM, 0.48 vs 0.38) within the full sample. In the high-balance subgroup, moderate SRM values (0.70) were found for the CBM and small values for the s-CBM (0.29). In the low-balance subgroup, moderate SRM values were found for the CBM (0.67) and high values for the s-CBM (0.80). For the full sample, CBM and s-CBM exceeded the lower but not the higher MID value. In the high-balance subgroup, the CBM exceeded both MID values, but the s-CBM exceeded only the lower. In the low-balance subgroup, CBM and s-CBM exceeded both MID values. Conclusions: The CBM is a suitable tool to detect intervention-related changes of balance and mobility in young, high-performing seniors. Both versions of the CBM scale show good sensitivity to change and responsiveness, particularly in young seniors with low balance.
Bibliographical noteFunding Information:
The dataset is from PreventIT. PreventIT was supported by the European Union's Horizon 2020 research and innovation program (grant no. 689238 ). The content is solely the responsibility of the authors and does not necessarily represent the official views of the European Union. The funders played no role in the design, conduct, or reporting of this study.
© 2021 The American Congress of Rehabilitation Medicine
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