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Table 2 Test-retest reliability of the German language version of the Evidence-based Practice Inventory (EBPI) for the complete sample (n = 344)

From: Cross-cultural adaptation, internal consistency, test-retest reliability and feasibility of the German version of the evidence-based practice inventory

Dimension Dimension 1 Dimension 2 Dimension 3 Dimension 4 Dimension 5
Description of dimension Attitude Subjective norm Perceived behavioural control Decision making Intention and behaviour
Items included in dimension Item 1–8 Item 9–13 Item 14–19 Item 20–22 Item 23–26
Scale range 8–48 5–30 6–36 3–18 4–24
Number completed dimension 343 327 344 342 344
Mean ± SD score 1st measure 39.1 ± 6.4 18.3 ± 5.9 28.1 ± 5.7 13.0 ± 2.7 15.6 ± 4.3
Mean ± SD score 2nd measure 39.3 ± 6.0 19.0 ± 5.7 28.4 ± 5.6 13.2 ± 2.6 15.9 ± 4.2
Mean difference absolute (95% CI) 0.2 (−0.2 to 0.6) 0.7 (0.4 to 1.0) 0.3 (0.0 to 0.7) 0.2 (0.0 to 0.4) 0.3 (0.1 to 0.6)
Mean difference relative to score of 1st measure 0.5% 2.8% 1.0% 1.5% 1.9%
P value for mean difference 0.29 < 0.01 0.08 0.03 < 0.01
σ2p 31.9 29.1 25.8 5.4 15.3
σ2o 0.0 0.2 0.0 0.0 0.0
σ2residual 6.8 4.7 6.3 1.5 2.4
ICCAGREEMENT 0.82 0.86 0.80 0.78 0.86
95% CI for ICC 0.79 to 0.86 0.82 to 0.88 0.76 to 0.84 0.73 to 0.82 0.83 to 0.89
P value for ICC < 0.01 < 0.01 < 0.01 < 0.01 < 0.01
SEMAGREEMENT (absolute value) 2.6 2.2 2.5 1.2 1.6
SEMAGREEMENT (relative to scale range) 6.5% 8.8% 8.3% 8.0% 8.0%
τ -correlation a −0.23 −0.08 −0.27 −0.12 −0.17
Normal distribution of differences b p < 0.01 p < 0.01 p < 0.01 p < 0.01 p < 0.01
95% LoA (log as function of X) −0.24X + 0.2 to 0.24X + 0.2 0.37X + 0.7 to − 0.37X + 0.7 0.34X + 0.3 to − 0.34X + 0.3 −0.29X + 0.2 to 0.29X + 0.2 0.32X + 0.3 to − 0.32X + 0.3
MDC90 6.1 5.2 5.8 2.9 3.6
MDC95 7.2 6.2 7.0 3.5 4.3
  1. SD Standard deviation, CI Confidence interval, σ2p Variance between participants, σ2o variance due to systematic differences between questionnaire administrations, σ2residual Residual variance, ICC Intraclass correlation coefficient, SEM Standard error of measurement, LoA Absolute limits of agreement with 95% confidence, X test score, MDC90 minimal detectable change with 90% confidence, MDC95 Minimal detectable change with 95% confidence
  2. aKendall’s Tau correlation between absolute difference and mean scores of two measures; b Shapirow Wilk test of Normality