Table 1.

Demographic and behavioral differences across birth cohorts

Birth cohort Age at time of survey (2015)	Before 1960 >55 n = 197		1960–69 46 – 55 n = 191		1970–79 36 – 45 n = 206		1980–89 26 – 35 n = 282		1990–96 19 – 25 n = 147
	n	%	n	%	n	%	n	%	n	%	Chi-Sq	p

Race or Ethnicity
Black	9	4.3	14	6.9	27	12.7	23	8	10	6.3	78.97	< .001
Latino	11	5.3	14	6.9	23	10.8	52	18	35	22.2
White	182	87.9	164	80.4	137	64.3	188	65.1	92	58.2
Multiracial/Other	5	2.4	12	5.9	26	12.2	26	9	21	13.3
Employment
Unemployed, student, disability, retired	67	34	15	7.3	15	7.3	20	7.1	20	13.6	154.38	< .001
Employed part-time (and/or full-time student)	31	15.7	24	12.6	13	6.3	24	8.5	47	32
Employed full-time	99	50.3	144	75.4	178	84.6	238	84.4	80	54.4
Income
< $20,000	21	10.7	22	11.5	16	7.8	32	11.3	58	39.5	152.11	< .001
$20,000 – $49,999	64	32.5	60	31.4	62	30.1	134	47.5	78	49
$50,000 +	112	56.9	109	57.1	128	62.1	116	41.1	17	11.6
Education
High school or less	10	5.1	11	5.8	12	5.8	21	7.4	10	6.8	7.58	0.48
Some college	66	33.5	72	37.7	70	34	90	31.9	63	42.9
4-year college degree	121	61.4	108	56.5	124	60.2	171	60.6	74	50.3
U.S Geographic region
Northeast	52	25.1	34	16.7	41	19.2	48	16.6	29	18.4	11.87	0.46
Midwest	31	15.0	44	21.6	35	16.4	56	19.4	26	16.5
South	64	30.9	75	36.8	73	34.3	104	36.0	61	38.6
West	60	29.0	51	25.0	64	30.0	81	28.0	42	26.6
Sexual identity
Gay	185	93.9	185	96.9	194	94.2	273	96.8	137	93.2	4.54	0.34
Bisexual	12	6.1	6	3.1	12	5.8	9	3.2	9	6.8
Relationship status
Single	98	49.7	89	46.6	95	46.1	122	43.3	86	58.5	9.75	0.046
In a relationship	99	50.3	102	53.4	111	53.9	160	56.7	61	41.5
Has a primary care provider (a doctor)	179	91.3	160	84.7	161	78.9	191	68.5	82	57.7	69.51	< .001
Does s/he know you have sex with men? valid n = 773	140	78.2	134	83.8	133	82.6	162	84.8	58	70.7	9.423	0.051
Currently taking PrEP
No	199	96.1	189	92.6	197	92.5	255	88.2	150	94.9	12.77	0.01
Yes	8	3.9	15	7.4	16	7.5	34	11.8	8	5.1
CAS ¹ with a casual male partner or HIV+/uknown status main partner, < 90 days (excluding participants on PrEP)
No	138	69.3	129	68.3	128	65	173	67.8	107	71.3	1.76	0.78
Yes	61	30.7	60	31.7	69	35	82	32.2	43	28.7

Note

CAS = Condomless anal sex