Table.

Characteristics of Study Participants

	Year 1			Year 2
Total festival attendance, n	11,000			9,000
	Total screened	Anti-HBc+	HBsAg+	Total screened	Anti-HBc+	HBsAg+	Anti-HCV+
Study participants, n (%)	173 (1.6*)	29 (17)	1 (<1)	231 (2.6*)	29 (13)	3 (1)	1 (<1)
Age, years (%)
<18	1 (<1)	0	0	12 (5)	0	0	0
18—44	58 (34)	9 (31)	1	84 (36)	6 (21)	0	0
45—65	90 (52)	18 (62)	0	99 (43)	16 (55)	3	0
>65	20 (12)	1 (3)	0	21 (9)	2 (7)	0	0
Unknown/missing	4 (2)	1 (3)	0	15 (6)	5 (17)	0	1
Gender, n (%)
Female	111 (64)	19 (66)	0	137 (59)	10 (35)	1	1
Male	62 (36)	10 (35)	1	93 (40)	19 (66)	2	0
Unknown/missing	0 (0)	0	0	1 (<1)	0	0	0
Ethnicity/race, n (%)
Hispanic	47 (27)	0	0	90 (39)	9 (31)	0	1
Non-Hispanic white	43 (25)	3 (10)	0	72 (31)	4 (14)	0	0
Asian	54 (31)	22 (76)	1	51 (22)	11 (38)	3	0
Black	7 (4)	0	0	13 (6)	2 (7)	0	0
Unknown/missing	24 (14)	4 (14)	0	7 (3)	3 (10)	0	0
Personal history of hepatitis (self-reported), n (%)
No	N/A	N/A	N/A	167 (72)	12 (41)	3	1
Yes	N/A	N/A	N/A	10 (4)	2 (7)	0	0
Unknown/missing	N/A	N/A	N/A	54 (23)	15 (52)	0	0
Vaccinated for hepatitis B virus (self-reported), n (%)
Yes	N/A	N/A	N/A	42 (18)	2 (7)	0	0
Unknown/missing	N/A	N/A	N/A	189 (82)	27 (93)	3	1
Family history of hepatitis (self-reported), n (%)
No	N/A	N/A	N/A	145 (63)	10 (34)	1	0
Yes	N/A	N/A	N/A	20 (9)	0	0	0
Unknown/missing	N/A	N/A	N/A	66 (29)	19 (66)	2	1

^*Percent of people screened out of the total estimate of festival attendees.

Anti-HBc=hepatitis B core antibody; anti-HCV=hepatitis C antibody; HBsAg=hepatitis B surface antigen; N/A=not available. (Questions pertaining to personal and family history of hepatitis and previous vaccination were added in the second year.)