Table 2 Participants’ characteristics by study completion status

Study group,%

n.s.

- Pick-Klop

80.8

19.2

- Psychoeducation

71.7

28.3

- Waiting list

78.3

21.7

Age in years

31.2 ±12.0 (19, 66)

32.8 ±12.7 (18, 59)

n.s.

Gender,%

n.s.

- Female

79.5

20.5

- Male

75.0

25.0

Education,%

0.01

- Professional school

74.7

25.3

- University degree

83.3

16.7

Smoking history

- Age at start of smoking

16.2 ±2.6 (8, 27)

16.4 ±2.9 (11, 20)

n.s.

- Years of cigarette smoking

15.0 ±12.0 (1, 49)

16.4 ±12.0 (3, 40)

n.s.

- No. of cigarettes smoked/day

15.4 ±7.2 (3, 50)

14.0 ±10.0 (4, 40)

n.s.

- No. of previous attempts to quit

2.5 ±2.3 (0, 17)

3.1 ±2.8 (0, 12)

n.s.

Have previously sought help to quit,%

n.s.

- Yes

82.9

17.1

- No

76.9

23.1

Living with a smoker,%

n.s.

- Yes

77.0

23.0

- No

78.8

21.2

Stage of change,%

0.006

- Precontemplation

89.3

10.7

- Contemplation

73.2

26.8

- Preparation

66.7

33.3

Fagerström Test for Nicotine Dependence

3.2 ±2.1 (0, 8)

3.1 ± 2.1 (1, 8)

n.s.

Attitudes Towards Nicotine Replacement Therapy Scale

- Perceived advantage

19.2 ±8.3 (0, 35)

19.4 ±9.8 (2, 32)

n.s.

- Drawback

10.3 ±4.5 (2, 20)

10.3 ±4.3 (4, 20)

n.s.

- “Don’t know” answers

2.2 ±2.8 (0, 11)

2.7 ±3.2 (0, 8)

n.s.

Attitudes Towards Smoking Scale

- Adverse effects of smoking

38.9 ±6.7 (15, 50)

38.7 ±7.8 (15, 50)

n.s.

- Psychoactive benefits of smoking

13.7 ±3.9 (4, 20)

15.3 ±4.5 (6, 20)

0.008

- Pleasure of smoking

14.5 ±3.6 (4, 20)

13.5 ±3.4 (5, 20)

n.s.

Smoking Self-Efficacy Questionnaire

- Internal score

15.2 ± 6.2 (5, 30)

15.8 ±5.9 (6, 30)

n.s.

- External score

13.0 ±6.1(4, 30)

14.1 ±6.7 (4, 28)

n.s.

- Total score

28.2 ± 10.9 (10, 60)

29.9 ± 11.3 (12, 55)

n.s.

Psychiatric disorder history,%

n.s.

- Depression/mood disorder

69.8

30.2

- Other disorder

72.7

27.3