Table 2.

Example of questions to asses the outcome measure determinants of a healthy and active lifestyle following the guidelines of Ajzen according to the theory of planned behaviour

Healthy behaviour
Eating two pieces of fruit every day
TPB items	Question asked	Rating
Attitude	If I eat two pieces of fruit every day for the next 3 months, that would be …	Bad 1/2/3/4/5/6/7 Good
Perceived norm	Most people who are important to me approve that I eat two fruits every day for the next 3 months	Disagree 1/2/3/4/5/6/7 Agree
Self-efficacy	I am confident that I can eat two pieces of fruit every day for the next 3 months	False 1/2/3/4/5/6/7 True
Intention	I intend to eat two pieces of fruit every day for the next 3 months	Unlikely 1/2/3/4/5/6/7 Likely
Past behaviour	In the past 3 months, I have eaten two pieces of fruit every day	False 1/2/3/4/5/6/7 True

TPB, theory of planned behaviour.