Table 3.

Demographics of participants

	PPCOSII (N=750)	AMIGOS (N=900)	P value*
Age (years), mean±SD	28.9±4.3	32.2±4.2	<0.001
Ethnicity
Hispanic	17.1%	10.4%	<0.001
Race
White	78.7%	80.2%	0.002
Black	13.3%	9.3%
Asian	3.2%	6.6%
American Indian	0.9%	1.1%
Native Hawaiian	0.3%	0.0%
Mixed race	3.6%	2.8%
Education			<0.001
High school	23.1%	8.1%
College	65.5%	65.4%
Graduate school	11.5%	26.4%
Income			<0.001
<$50,000	40.0%	16.9%
$50–100,000	40.5%	44.3%
>$100,000	5.2%	21.2%
Wish to not answer	14.3%	17.6%

^*P values were calculated with the use of the chi-square test or Fisher’s exact test for categorical data and the Wilcoxon rank-sum test for continuous data