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Table 2 Measurement of behavioral determinants: items and psychometric properties

From: Effectiveness of a worksite mindfulness-based multi-component intervention on lifestyle behaviors

Determinant Item (on a 7-point Likert scale) Cronbach’s α
   T0 T1 T2
Perceived behavioral control Exercising vigorously for at least 3 times 20 minutes this week is for me (completely possible – completely impossible) .76 .67 .70
Physical activity If I wanted to, I could exercise vigorously for at least 3 times 20 minutes this week (I completely agree- I completely disagree)    
How much control do you experience on the amount of vigorous physical activity you have this week? (no control – complete control)*    
The extent to which I exercise vigorously this week is mostly up to me. (completely agree- completely disagree)    
Perceived behavioral control Eating at least 2 pieces of fruit per day this week is for me (completely possible – completely impossible) .40** .28** .30**
Fruit intake If I wanted to, I could eat at least 2 pieces of fruit per day this week (I completely agree- I completely disagree)    
How much control do you experience on the amount of fruit you eat this week? (no control – complete control)*    
The extent to which I eat fruit this week is mostly up to me. (completely agree- completely disagree)    
Intention I intend to exercise vigorously for at least 3 times 20 minutes this week. (completely agree- completely disagree) .94 .90 .86
Physical activity I try to exercise vigorously for at least 3 times 20 minutes this week. (completely agree- completely disagree)    
Intention I intend to eat daily at least 2 pieces of fruit this week. (completely agree- completely disagree) .96 .94 .93
Fruit intake I try to eat daily 2 pieces of fruit this week. (completely agree- completely disagree)    
Perceived barriers (lack of time) I do not have enough time to engage in vigorous physical activity at least 3 times for 20 minutes this week, because of my work. (completely agree- completely disagree)* .71 .82 .76
Physical activity I do not have enough time to engage in vigorous physical activity at least 3 times for 20 minutes this week, because of my family life/ social life. (completely agree- completely disagree)*    
  1. *Negative items have been recoded for analyse.
  2. **Cronbach’s alpha is unacceptable, even when items were deleted. Therefore, items have been analysed separately.