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Table 3 The internal consistency and stability of the questionnaire as measured by Cronbach’s alphas and intraclass correlation coefficient (ICC)

From: The transtheoretical model (TTM) questionnaire for smoking cessation: psychometric properties of the Iranian version

 

Number of items

Cronbach’s alphas

ICC

Processes of change

20

0.79

0.70

Behavioral

10

0.72

0.77

Experiential

10

0.69

0.71

Temptation

9

0.82

0.90

Social situations

3

0.75

0.78

Habitual/craving

3

0.80

0.83

Negative affect situations

3

0.84

0.79

Decisional balance

6

0.60

0.71

Pros of smoking

3

0.79

0.82

Cons of smoking

3

0.60

0.61

Total

35

0.80

0.65

  1. Figures in bold are calculated for Process of change, Temptation, Decisional Balance, and for the all items.