Appendix Table 1.

Demographic characteristics of survey responders and non-responders

Category	Participants n=502	Non-participants* n = 777	p
Female Parent (%)	42.8	38.8	0.16
Parent Age (years (SD))	39.5 (789)	37.3 (8.0)	< 0.001
Parent Race/ethnicity (%)			< 0.001
White, non Hispanic	66.5	46.7
Black, non Hispanic	7.4	15.4
Hispanic	18.5	31.8
Other	7.6	6.0
Region (%)			0.37
Northeast	15.3	14.1
Midwest	23.5	20.5
South	33.8	28.3
West	27.3	27.2
Residence in a Metropolitan Area (%)	88.1	84.2	0.06
Income (%)			< 0.001
<$50,000	31.5	48.6
$50,000–99,000	37.0	27.9
>= $100,000	31.5	23.5
Parent education (%)			< 0.001
Less than High School	7.2	15.9
High School	22.9	27.2
Some College	25.3	32.1
Bachelor’s degree or higher	44.6	24.9
Number of children in household (n (SD))
Age 0–1	0.1 (0.3)	0.1 (0.4)	0.49
Age 2–5	0.5 (0.7)	0.5 (0.7)	0.13
Age 6–12	1.3 (0.9)	1.2 (0.8)	0.03
Age 13–17	0.4 (0.7)	0.4 (0.7)	0.18
Number of people in household (n (SD))	4.4 (1.3)	4.4 (1.3)	0.55
Respondent is married (%)	82.3	68.9	<0.001

Note: Percentages are unweighted and may therefore differ from estimates in Table 1

^*777 non-participants includes 635 of the 1,279 invited participants who did not respond to the invitation; 97 of the participants who responded to the survey invitation, but who refused to provide required child height, weight, or age data; and 45 of the participants who responded to the survey invitation, but provided data where the height, weight, or BMI z-scores were ≥ 5 or ≤ −5.