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Table 2 Overview of psychometric properties of the instruments

From: German language questionnaires for assessing implementation constructs and outcomes of psychosocial and health-related interventions: a systematic review

Psychometric properties

N

%

M

SD

Md

min

max

Internal consistency

30

97

1.8

1.4

2.0

-1

4

Convergent validity

5

16

0.6

1.4

4.0

0

4

Discriminant validity

5

16

0.6

1.4

4.0

0

4

Known-groups validity

2

6

0.2

0.9

3.5

0

4

Predictive validity

2

6

0.1

0.2

1.0

0

1

Concurrent validity

10

32

0.5

1.0

2.0

-1

3

Structural validity

21

68

1.5

1.8

2.0

-1

4

Responsiveness

0

0

0.0

0.0

0.0

0

0

Norms

14

45

1.3

1.6

3.0

0

4

Usability

31

100

3.2

0.6

3.0

2

4

Test-retest reliability

3

10

0.1

0.3

1.0

0

1

Face and content validity

29

94

0.9

0.2

1.0

0

1

  1. Abbreviations: M mean over all ratings, max maximum, Md median rating considering only those instruments which provided information on that aspect, min minimum, n number of instruments with a rating of −1, 1, 2, 3 or 4; %, percentage of instruments with a rating of −1, 1, 2, 3 or 4, SD standard deviation over all ratings
  2. Explanation: This table displays the aggregated rating information for each psychometric property based on 31 identified instruments. Rating ranges from − 1 “poor”, 0 “no information”, 1 “minimal emerging”, 2 “adequate”, 3 “good”, 4 “excellent” for all the psychometric properties except test-retest reliability, and face and content validity where the rating was 0 “no information provided” and 1 “information provided”