Abstract
Purpose: To reduce ceiling effects on domain scores (Task, Goal, and Bond) of the Working Alliance Inventory (WAI)-Rehabilitation Dutch Version by changing response scales and using Visual Analogue Scales (VASs).
Methods: Clients, who had at least three treatment sessions prior, randomly received one of the three versions of the WAI-Rehabilitation Dutch Version, using items with a balanced Likert scale, Positive-Packed Likert scale or VAS. Primary outcome was percentage of ceiling effects in total- and domain scores, secondary outcomes were construct validity and internal consistency of the three versions.
Results: One hundred and seventy-six clients randomly received a set of questionnaires (one of the three versions of the WAI-Rehabilitation Dutch Version, Session Rating Scale (SRS) and Helping Alliance Questionnaire (HAQ)-II); 152 participants (mean age 51.5 ± 16.3, 106 women) returned the questionnaires. No ceiling effects were present in the total scores of all versions. Significantly fewer ceiling effects were found in the VAS-Version (Goal: 8.0%, Bond: 7.7%) compared to the original (Goal: 18.0%, Bond: 29.8%) and Positive-Packed Version (Goal: 27.1%, Bond: 29.8%). Spearman’s correlations between VAS-Version, SRS and HAQ-II ranged 0.747–0.845.
Conclusions: Visual Analogue Scales effectively reduced ceiling effects on domain scores of the WAI-Rehabilitation Dutch Version, while maintaining validity.
Visual Analogue Scales effectively reduced ceiling effects on domain scores of the Working Alliance Inventory-Rehabilitation Dutch Version, while maintaining construct validity.
The Working Alliance Inventory version with Visual Analogue Scales can be used in rehabilitation.
Implications for Rehabilitation
Acknowledgements
Special thanks to all the participants and health professionals who have contributed to this study.
Disclosure statement
The authors report no declarations of interest.