TABLE 2.

Demographic Characteristics and Risk Behaviors Among Adolescent Boys and Young Men in 3 US Cities: Project SHIELD, 2000–2001

	Have Anal Intercourse (n = 102), % or Mean (SD)	Have Not Had Anal Intercourse (n = 482), % or Mean (SD)	χ2 or ta	df
White	20	19	.16	3
Estimated family income < $30 000	70	58	5.04*	1
Sexual orientation other than heterosexual	4	1	13.84**	3
Living with partner	18	15	0.39	1
Partner has threatened or forced sexual intercourse	4	3	0.41	1
Has attempted suicide	13	7	3.76	1
Used drugs/alcohol at time of last sexual act	40	29	4.36*	1
Sexual partner had multiple partners	50	38	4.83*	1
Had sexual intercourse with sex trader	7	3	5.07*	1
Ever diagnosed with STI	6	7	0.13	1
Age at sexual debut, y	14.2 (2.2)	14.1 (2.5)	0.122	578
Sexual partners in prior 90 d, no.	2.88 (2.7)	2.41 (3.1)	1.42	576
Percentage of vaginal sexual acts protected	0.42 (0.35)	0.48 (0.39)	−1.61	535
Drug influence scale score	6.4 (2.2)	6.3 (2.1)	0.369	568
Hedonism scale for condom use score	12.5 (4.3)	11.5 (3.9)	2.22*	577
Perceived invulnerability scale score	3.2 (1.5)	2.8 (1.2)	2.70**	130
Other drugs scale score	0.58 (1.1)	0.38 (0.84)	1.90	130
Alcohol use in previous 30 days, d	6.96 (8.6)	6.51 (7.6)	0.525	568
Marijuana use in previous 30 days, d	16.30 (12.3)	14.10 (12.3)	1.40	425

Note. STI = sexually transmitted infection.

^aDichotomous variables were compared by the χ² test. All others were compared by the t test.

*P < .05; **P < .01.