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Table 2 Reproducibility of the test-retest measurements of the ACP Engagement Survey (34 items) and its subscales

From: Measuring advance care planning behavior in Dutch adults: translation, cultural adaptation and validation of the Advance Care Planning Engagement Survey

  Intraclass correlation coefficient (95% CIa) Mean change (SDb) Limits of agreementc Bland Altman’s: t-test; linear regressiond
Total ACP Engagement (mean of all items) 0.88 (0.84–0.91) 0.019 (0.593) −1.14 to 1.18 p = 0.6; p = 0.7
Subscale: Knowledge 0.64 (0.53–0.72) −0.103 (1.318) − 2.69 to 2.48 p = 0.2; p = 0.2
Subscale: Contemplation 0.84 (0.79–0.88) −0.167 (0.923) −1.98 to 1.64 p = 0.006; p = 0.7
Subscale: Self-efficacy 0.82 (0.76–0.86) 0.052 (0.724) −1.37 to 1.47 p = 0.3; p = 0.6
Subscale: Readiness 0.87 (0.83–0.90) −0.055 (0.725) −1.48 to 1.37 p = 0.3; p = 0.5
  1. aCI Confidence intervals
  2. bSD Standard deviation
  3. cMean change in scores +/− 1.96 x standard deviation (SD) of the changes
  4. dLinear regression with the difference score and the means