Background: In stroke rehabilitation, measurement tools measuring self-efficacy with sound psychometric properties are needed. The Stroke Self-Efficacy Questionnaire (SSEQ) has recently been translated and validated into a Danish version (SSEQ-DK).
Objectives: To evaluate the test-retest reliability of the SSEQ-DK.
Methods: Fifty people with stroke ≥ 18 years in the sub-acute and chronic phase were included from February 2019 to August 2020. The SSEQ-DK was completed twice; on day 1 and day 7-14. Test-retest reliability of the single items was assessed using weighted Cohen's kappa and percentage agreement. The activity and self-management scales were assessed by the intraclass correlation coefficient (ICC). Measurement error was assessed by calculating the Smallest Detectable Change (SDC) based on the standard error of measurement.
Results: Overall, kappa values showed fair to substantial test-retest reliability of the single items. However, several kappa values were missing as the statistical prerequisites were not present. The percentage agreement ranged from 78% to 94%. Based on the reported confidence interval of the estimated intraclass correlation coefficient, the test-retest reliability of the activity and self-management scales was poor to excellent in all analysis. Ceiling effects appeared in the single items. Conversely, no floor effect was seen.
Conclusion: The SSEQ-DK showed good test-retest reliability of the single items based on agreement among a population with stroke in the subacute and chronic phase. Broad ICC confidence intervals bar any firm conclusions concerning the test-retest reliability of the activity and self-management scales.
Trial registration: ClinicalTrials.gov NCT03183960. Reg. 15 June 2017.
Keywords: Self-efficacy; psychometric properties; rehabilitation; stroke; test-retest reliability.