*3.4. Model 3: Creating a Model to Identify Family Characteristics Influencing BMI z-Score Change*

The only family characteristic that added significantly to model 2, and was therefore included in model 3, was having a mother with obesity (*p* = 0.019).

This model also showed that the corrected mean differences in change of BMI z-score were significant, both at T6 (+0.07 in 2020 versus −0.08 in 2019, difference = 0.15, 95% CI 0.02, 0.27, *p* = 0.024) and T12 (+0.08 in 2020 versus −0.10 in 2019, difference = 0.18, 95% CI 0.03, 0.32, *p* = 0.016). Additionally, the frequency of no-show consultations remained a significant contributor (*p* = 0.025).
