Table 2. Univariate and multivariate regression analyses of factors associated with an increased BMI z-scores during the COVID-19 period.

Parameters		Univariate analysis					Multivariate analysis
		β	95% CI		SE	P value	β	95% CI		SE	P value
			Lower	Upper				Lower	Upper
Sex		0.060	−0.045	0.165	0.053	0.260
Age (at school closure)		−0.005	−0.027	0.016	0.011	0.642
Reasons for a clinic visit
	Growth assessment in general	0.033	−0.091	0.157	0.063	0.601
	Weight gain	−0.040	−0.187	0.106	0.074	0.588
	Short stature	0.037	−0.072	0.147	0.056	0.502
	Early puberty	−0.044	−0.158	0.070	0.058	0.449
No. of days after school closure		0.002	0.001	0.004	0.001	0.002	0.002	0.001	0.003	0.001	0.005
Tanner stage
	I	0.009	−0.112	0.131	0.062	0.879
	II	0.022	−0.086	0.129	0.055	0.690
	III	−0.036	−0.145	0.073	0.055	0.513
	IV	0.034	−0.218	0.286	0.128	0.792
Weight status in the pre-COVID-19 period
	Obesity	−0.143	−0.288	0.003	0.074	0.055
	Overweight	−0.152	−0.329	0.026	−0.112	0.093
	Normoweight	0.147	0.036	0.258	0.057	0.010	0.127	0.017	0.238	0.056	0.017
	Underweight	0.257	−0.084	0.599	0.173	0.139

BMI = body mass index, COVID-19 = coronavirus disease 2019, CI = confidence interval, SE = standard error.