Table 3.

Distribution of principal characteristics of adolescents with or without parental information

Adolescent characteristics		Parental participation in the baseline web questionnaire
		Adolescents without parental information (n = 5361)		Adolescents with parental information (n = 6046)
		n	%	n	%
Age (mean ± SD)		5301	11.2 ± 0.90	6011	11.2 ± 0.78
Waist circumference (mean ± SD)		4821	64.1 ± 7.92	5920	64.4 ± 7.97
Sex	Female	2873	53.6%	3108	51.4%
	Male	2485	46.4%	2938	48.6%
BMI categories (baseline, IOTF)	Underweight	537	11.2%	638	10.9%
	Normal weight	3472	72.7%	4382	74.7%
	Overweight	63	13.3%	707	12.0%
	Obese	131	2.7%	143	2.4%
Mother tongue	Finnish	4874	91.0%	5681	94.0%
	Swedish	238	4.4%	286	4.7%
	Other	246	4.6%	79	1.3%
Puberty phase	Pre-pubertal	1117	30.5%	1784	36.8%
	Pubertal	2500	68.2%	3027	62.4%
	Post-pubertal	48	1.3%	39	0.8%

IOTF, International Obesity Task Force.⁴¹