Table 1.

Univariate comparison of exclusive injectors and non-exclusive injectors in Tallinn, Estonia, 2007

	Exclusive injectors		Non-exclusive injectors		OR	95%CI	p-value
Variable	n	%	n	%
Gender:
Male	250	83.06	44	89.80	1.0
Female	51	16.94	5	10.20	0.56	0.21-1.47	0.233
Age (mean):	301	(26.5)	49	(26.8)	-	-	0.737*
Ethnicity:
Russian	249	85.57	37	80.43	0.69	0.31-1.54	0.369
Estonian	42	14.43	9	19.57	1.0
Marital status:
Single	232	77.85	35	71.43	0.71	0.36-1.40	0.324
Married or cohabiting	66	22.15	14	28.57	1.0
Educational level (years):
<9	163	54.33	23	46.94	0.74	0.41-1.36	0.337
10–12	137	45.67	26	53.06	1.0
Main source of income in last 6 months:
Regular or temporary job	154	51.16	33	67.35	1.0
Other	147	48.84	16	32.65	0.51	0.27-0.96	0.035
Drug use initiation:
Injecting	101	33.55	11	22.45	0.57	0.28-1.17	0.126
By other means of  administration	200	66.45	38	77.55	1.0
Age at IDU initiation (mean)	299	(18.6)	49	(19.6)	-	-	0.149*
Duration of injection career (mean)	299	(7.9)	49	(7.2)	-	-	0.256*
Frequency of injecting:
Less than daily	83	27.57	26	53.06	1.0
Daily	218	72.43	23	46.94	0.33	0.18-0.62	0.001
Other routes of administration:
Less than daily	-	-	41	83.67	-	-	-
Daily	-	-	8	16.33	-	-	-
Intensity of injecting per day:
One	49	16.33	12	24.49	1.0
More than one	251	83.67	37	75.51	0.60	0.29-1.24	0.167
Main drug injected during last 6 months:
Fentanyl	219	73.99	30	62.50	0.59	0.31-1.11	0.101
Amphetamine	73	24.66	17	35.42	1.67	0.88-3.20	0.121
Ever had overdose:
No	110	36.54	18	36.73	1.0
Yes	191	63.46	31	63.27	0.99	0.53-1.86	0.980
Sharing syringes during last 6 months:
No	189	63.00	34	72.34
Yes	111	37.00	13	27.66	0.65	0.33-1.29	0.217
Sharing paraphernalia during last 6 months:
No	231	77.00	38	79.17	1.0
Yes	69	23.00	10	20.83	0.88	0.42-1.86	0.739
Number of sexual partners during last 12 months:
None or one	171	57.38	20	40.82	1.0
More than one	127	42.62	29	59.18	1.95	1.06-3.61	0.033
Condom use with casual partner during last 6 months:
Always	63	57.27	16	69.57	1.0
Never /Occasionally	47	42.73	7	30.43	0.59	0.22-1.54	0.278
Condom use with primary partner during last 6 months:
Always	48	33.80	9	30.00	1.0
Never /Occasionally	94	66.20	21	70.00	1.19	0.51-2.80	0.688
Self-reported STI (syphilis, gonorrhea, chlamydia, genital herpes):
No	274	91.03	39	79.59	1.0
Yes	27	8.97	10	20.41	2.60	1.17-5.79	0.019
Disease serostatus:
HIV+	175	58.72	17	34.69	0.37	0.20-0.70	0.002

^*t-test