Table 1.

Characteristics of the sample at each period of data collection.^*

Males	Baseline, N=353		1 Year Follow-up, N=161*		2 Year Follow-up, N=320
	Mean	SD	Mean	SD	Mean	SD
age (yrs)	14.7	1.84	16.4	1.68	16.6	1.84
bmi (mean)	22.2	5.12	22.6	4.39	23.7	5.39
pbf (%)	16.3	9.66	14.4	7.13	16.6	9.28
total sleep (hrs)	8.66	1.04	8.33	1.09	8.44	1.05
energy intake (kcal)**	2194	672	NA	NA	2249	723
depression (mean)	14.9	3.65	14.9	3.30	15.11	3.86
puberty (mean)	2.59	0.67	3.13	0.60	3.28	0.63
activity (min/d)**	320.8	73.8	NA	NA	305.3	64.3
screen time (min/d)	346	232	362	236	350	226
	%		%		%
white	85.8%		93.2%		88.8%
grade 9–12	51.0%		83.2%		84.7%
parent college graduate	76.9%		80.1%		79.6%
free or reduced lunch	11.0%		5.59%		7.50%
Females	Baseline, N=370		1 Year Follow-up, N=171*		2 Year Follow-up, N=328
	Mean	SD	Mean	SD	Mean	SD
age (yrs)	14.7	1.83	16.3	1.72	16.6	1.88
bmi (mean)	22.0	5.01	22.3	4.61	22.9	4.82
pbf (%)	26.4	8.76	26.1	7.71	27.6	8.01
total sleep (hrs)	8.64	1.02	8.30	1.01	8.45	1.06
energy intake (kcal)**	1776	523	NA	NA	1777	506
depression (mean)	16.3	4.27	16.7	4.23	16.8	4.45
puberty (mean)	3.20	0.68	3.52	0.49	3.62	0.47
activity (min/d)**	299	63.1	NA	NA	280	52.0
screen time (min/d)	290	212	261	186	293	190
	%		%		%
white	83.5%		93.6%		85.4%
grade 9–12	55.9%		82.5%		82.0%
parent college graduate	72.0%		74.0%		74.9%
free or reduced lunch	12.7%		8.19%		8.81%

^*One year follow-up data were collected in IDEA only; baseline and two year follow-up data were collected in both studies.

^**Energy intake and activity were not assessed at one year follow-up in IDEA