Question: is this a 2) strong advice, 1) weak advice 0) no advice?

Other studies by Kwon et al18 and Giles et al17 also identified four BMI trajectories with similar patterns; those studies utilized a different technique known as group-based trajectory modelling, however, which assumes no within-class variation (i.e., variance in each subgroup is fixed to zero)8. 
user
This is no advice
assistant