Table 2.

Number of items, examples of questions and response options, and Cronbach α values for the theoretical constructs (n 337)

Variable (number of items)	Examples of items	Examples of response options	Cronbach's α
Intention (3)	Do you intend to stay in school to eat your lunch every day in the next 2 weeks?	Certainly not (1) to Certainly yes (5)	0·94
Attitude (4)	For you to stay in school…would be…?	Very boring (1) to Very stimulating (5)	0·84
Perceived behavioural control (3)	For you to stay in school…would be…?	Very easy (1) to Very difficult (5)	0·61
Perceived social norms (3)	Would most people important to you recommend that you stay in school…?	Certainly not (1) to Certainly yes (5)	0·70
Behavioural beliefs (4)	If you stay…would it allow you: (i) to be with your friends, (ii) to participate in school activities?	Certainly not (1) to Certainly yes (5)	0·61
Control beliefs: facilitating factors (3)	Would it help you to stay…if there was a larger choice of foods available in school?	Certainly not (1) to Certainly yes (5)	0·68
Self-efficacy (3)	Would you stay…even if you must wait to warm your meal in a microwave oven?	Certainly not (1) to Certainly yes (5)