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

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

σ²_p

31.9

29.1

25.8

5.4

15.3

σ²_o

0.0

0.2

0.0

0.0

0.0

σ²_residual

6.8

4.7

6.3

1.5

2.4

ICC_AGREEMENT

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

SEM_AGREEMENT (absolute value)

2.6

2.2

2.5

1.2

1.6

SEM_AGREEMENT (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