Hello everyone,

I am working on testing fruit and vegetable intake using the HAPA model and I'm planning to use SEM analysis.

Looking at the literature, it is highly recommended that to test behavior prediction it is necessary to measure the variables at 2 or more time points (depending on the theoretical model used).

In my case, I was planning to measure intention at T1 and action control and action planning at T2, but due to time constraints, if I do this I would be not finishing my thesis this semester and would need to take an extra one. I am wondering if it would be that necessary to use 2 time points (2 weeks difference).

I have ran t-test on the current sample (n=40) to see if there is a difference in action control and action planning scores between T1 and T2, and even though there is a significant difference (MD=0.212; 0.354 respectively, p=