Table 1.

Sample characteristics and comparison with individuals excluded because of missing phenotypic or genetic data

	Included (N = 401)				Not included (N = 352)				p valuea
	N	%	Median	IQR	N	%	Median	IQR
Age (years)	401		12.1	10.2	352		12.8	11.5	1.48e−01
Gender									8.26e−01
Female	213	53.1			191	54.3
Male	188	46.9			161	45.7
Ethnicity	347				289				2.11e−02
Asian	9	2.6			5	1.7
Black (African American)	3	0.9			6	2.1
Caucasian (Latino/Hispanic)	66	19.0			44	15.2
Caucasian (Not Latino/Hispanic)	215	62.0			162	56.1
Other	54	15.6			72	24.9

^aAge was analyzed using the Mann-Whitney test, while gender and ethnicity were analyzed using the Fisher test. IQR, interquartile range