Table 1 Item response rates for the SELC 20 + 20 (items 1–40) among nursing students (n = 310)

Knowledge

…confidence in theoretical knowledge about…

Tobacco

 i1

Identification of tobacco use

2

11

52

34

1

 i2

Health effects of tobacco use

1

6

46

47

0

 i3

Assessment of motivation for tobacco cessation

3

31

46

18

1

 i4

Advice about tobacco

5

23

47

23

1

 i5

Motivational strategies for tobacco cessation

1

36

43

13

2

Alcohol

 i6

Identification of alcohol consumption

3

13

52

30

1

 i7

Health effects of alcohol consumption

1

9

50

41

0

 i8

Assessment of motivation for decreased alcohol consumption

3

28

56

11

2

 i9

Advice about alcohol

5

28

44

21

1

 i10

Motivational strategies for decreased alcohol consumption

6

35

41

17

1

Physical activity

 i11

Identification of physical activity

1

6

42

50

1

 i12

Health effects of physical activity

1

3

31

65

0

 i13

Assessment of motivation for physical activity

1

16

55

27

0

 i14

Advice about physical activity

1

10

42

46

1

 i15

Motivational strategies for physical activity

1

17

47

34

1

Eating habits

 i16

Identification of eating habits

3

14

50

32

1

 i17

Health effects of eating habits

1

5

48

46

0

 i18

Assessment of motivation for healthier eating habits

16

23

54

20

1

 i19

Advice about eating habits

2

13

48

36

0

 i20

Motivational strategies for healthy eating habits

3

24

46

27

0

Ability

… confidence in practical ability to…

Tobacco

 i21

Identification of tobacco use

3

19

50

27

1

 i22

Health effects of tobacco use

1

14

52

31

3

 i23

Assessment of motivation for tobacco cessation

6

35

42

14

2

 i24

Advice about tobacco

5

29

44

20

2

 i25

Motivational strategies for tobacco cessation

9

38

40

11

2

Alcohol

 i26

Identification of alcohol consumption

4

18

52

24

2

 i27

Health effects of alcohol consumption

1

18

49

30

2

 i28

Assessment of motivation for decreased alcohol consumption

4

35

47

11

2

 i39

Advice about alcohol

6

36

39

17

2

 i30

Motivational strategies for decreased alcohol consumption

10

38

36

14

2

Physical activity

 i31

Identification of physical activity

2

10

43

44

1

 i32

Health effects of physical activity

1

5

41

51

1

 i33

Assessment of motivation for physical activity

2

21

49

26

1

 i34

Advice about physical activity

2

12

48

36

1

 i35

Motivational strategies for physical activity

3

20

42

32

2

Eating habits

 i36

Identification of eating habits

3

19

50

27

1

 i37

Health effects of eating habits

2

13

50

35

1

 i38

Assessment of motivation for healthier eating habits

3

29

50

16

2

 i39

Advice about eating habits

32

16

52

28

1

 i40

Motivational strategies for healthy eating habits

5

29

44

21

1