Table 3.

Parameter Estimates for the BMI (kg/m²) z-Score General Linear Mixed-Effects Model

	b-Coefficient	95% CI	p
Time	0.09 a	0.03–0.15	0.004
3-Week break	0.38	−0.39 to 1.24	0.389
7-Week break	0.03	−0.31 to 0.35	0.901
3-Week break × time	−0.10 a	−0.17 to −0.04	0.009
7-Week break × time	−0.11 a	−0.18 to −0.04	0.001
Played summer sports	0.08	−0.14 to 0.31	0.495
Sports × time	−0.01	−0.09 to 0.08	0.821
Attended summer camp	0.06	−0.23 to 0.33	0.764
Camp × time	0.05	−0.03 to 0.12	0.465

Referent for time is Spring 2018; referent for summer break length is 12 weeks (traditional school); referent for summer sports is not playing; referent for summer camps is not attending.

Bold and ^a denote statistical significance, p < 0.05.

CI, confidence interval.