Table 2.

Kaplan-Meier results for demographic variables associated with time to injection onset by drug (TTIOD).

	Heroin Mean in years (95% ∼CI)	Meth/Speed Mean in years (95% ∼CI)	Cocaine Mean in years (95% ∼CI)	Crack Cocaine Mean in years (95% ∼CI)
Sex by sexual orientation
Heterosexual male	1.15 (0.82, 1.42)	8.07 (6.39, 9.75)	10.88 (8.97, 12.80)	30.17 (27.84, 32.51)
Heterosexual female	1.03 (0.41, 1.67)	8.84 (6.37, 11.30)	14.14 (11.16, 17.12)*	28.10 (25.26, 30.94)
Gay/bisexual	0.79 (0.34, 1.24)	2.52 (1.62, 3.42)*	10.64 (7.16, 14.13)	21.57 (17.01, 26.12)
Lesbian/bisexual	1.07 (0.24, 1.90)	7.61 (4.39, 10.83)	11.72 (6.86, 16.58)	22.60 (17.34, 27.85)
Birth cohort
Pre-1960s	0.84 (0.45, 1.23)	10.37 (7.69, 13.05)	11.73 (9.23, 14.22)	33.45 (30.77, 36.13)
1960s	1.16 (0.66, 1.65)	5.66 (4.18, 7.14)	9.81 (8.01, 11.61)	25.00 (22.92, 27.08)
1970s	1.75 (1.00, 2.49)*	6.38 (4.80, 7.96)	9.53 (7.51, 11.56)	15.40 (13.13, 17.67)
1980s or later	1.12 (0.58, 1.65)	4.58 (3.49, 5.67)	7.63 (6.15, 9.11)*	8.36 (6.56, 10.17)*
Race
White	1.13 (0.73, 1.52)	5.43 (4.15, 6.71)*	9.02 (7.38, 10.66)	20.10 (17.90, 22.32)*
African American	1.50 (0.88, 2.13)	9.52 (6.39, 12.66)	12.87 (10.04, 15.71)	32.24 (29.13, 35.35)
Latino	0.55 (0.15, 0.94)*	12.91 (8.96, 16.87)	10.25 (7.72, 12.78)	29.55 (26.97, 32.12)
Other	1.07 (0.41, 1.73)	6.08 (3.74, 8.43)	15.82 (9.97, 21.68)	33.02 (27.93, 38.12)

∼CI= Confidence Interval;

^*p<0.05 based on Log Rank (Mantel-Cox)