Table 3.

Bivariate and multivariate analysis results for Armenia and Pereira.

		Armenia										Pereira
		HCV antibodies				Raw OR	CI 95%	p	AOR	A CI 95%	A p	HCV antibodies				Raw OR	CI 95%	p	AOR	A CI 95%	A p
		Positive		Negative								Positive		Negative
		n	%	n	%							n	%	n	%
Demographic characteristics
Socioeconomic level	Low	66	80.5	153	83.6	0.8	0.4–1.5	0.53	0.6	0.3–1.5	0.38	103	92.8	130	93.5	0.8	0.3–2.3	0.81	0.7	0.2–2.6	0.62
	Medium-high	16	19.5	30	16.4	1.0			1.0			8	7.2	9	6.5	1.0			1.0
Age	20 years old or younger	10	12.2	15	8.2	1.0			1.0			9	8.1	26	18.7	1.0			1.0
	21 to 24 years old	26	31.7	53	29.0	0.7	0.2–1-8	0.51	0.5	0.1–1.7	0.33	46	41.4	45	32.4	1.9	1.2–6.9	0.01	5.8	1.3–25.4	0.01
	25 to 28 years old	21	25.6	50	27.3	0.6	0.2–1.6	0.34	0.8	0.2–2.5	0.70	36	32.4	32	23.0	3.2	1.3–7.9	0.01	5.2	1.0–26.3	0.04
	Over 28 years old	25	30.5	65	35.5	0.5	0.2–1.4	0.23	0.8	0.2–2.4	0.70	20	18.0	36	25.9	1.6	0.6–4.0	0.32	1.2	0.2–7.2	0.73
Years of injection drug use	1 or less	14	17.1	40	21.9	1.0			1.0			10	9.0	23	16.5	1.0			1.0
	2−4	33	40.2	45	24.6	2.0	0.9–4.4	0.05	2.6	1.0–6.6	0.03	31	27.9	65	46.8	1.0	0.4–2.5	0.83	0.9	0.3–2.6	0.95
	5 or more	35	42.7	98	53.6	1.0	0.4–2.0	0.95	0.8	0.3–2.0	0.77	70	63.1	51	36.7	3.1	1.3–7.2	<0.001	3.0	1.7–7.8	0.02
injection behaviour during the previous 6 months
You have shared drug mix with another person, passing from one syringe to another	Yes	20	26.7	33	19	1.5	0.8–2.9	0.17	2.8	1.0–7.8	0.04	45	40.9	42	30.4	1.5	0.9–2.6	0.08	1.2	0.6–2.4	0.57
	No	55	73.3	141	81	1.0			1.0			65	59.1	96	69.6	1.0			1.0
You have shared cotton, rinsing water, or spoons.	Yes	35	45.5	79	43.1	1.1	0.6–1.8	0.72	1.0	0.4–2.3	0.89	68	62.4	80	58	1.2	0.7–2.0	0.48	0.7	0.2–1.7	0.48
	No	42	54.5	103	56.9	1.0			1.0			41	37.6	58	42	1.8
You have used water to clean needles and syringes previously used by another person	Yes	16	19.5	37	20.2	0.9	0.4–1.8	0.89	1.1	0.3–3.5	0.78	61	55	50	36	2.1	1.3–3.6	<0.01	1.1	0.3–3.8	0.78
	No	66	80.5	146	79.8	1.0			1.0			50	45	89	64	1.0			1.0
You have obtained drug dose from a drug mix shared by others	Yes	15	19	35	19.4	0.9	0.4–1.9	0.93	0.5	0.1–1.8	0.35	59	53.6	64	46.4	1.3	0.9–2.2	0.25	1.2	0.5–2.8	0.57
	No	145	80.6	64	81	1.0			1.0			51	46.4	74	53.6	1.0			1.0
You have injected at an indoor site to which people go to inject drugs	Yes	68	86.1	132	72.9	2.2	1.1–4.6	0.02	2.2	0.9–5.4	0.07	83	75.5	113	81.9	0.6	0.3–1.2	0.21	0.4	0.1–0.9	0.03
	No	11	13.9	49	27.1	1.0			1.0			27	24.5	25	18.1	1.0			1.0
You have injected at an outdoor site to which people go to inject drugs	Yes	65	83.2	142	78.9	1.2	0.6–2.4	0.5	0.7	0.3–1.7	0.47	100	90.9	127	92	0.8	0.3–2.1	0.75	1.4	0.4–4.6	0.51
	No	14	17.7	38	21.1	1.0			1.0			10	9.1	11	8	1.0			1.0
You have been injected by someone that charges to inject drugs	Yes	18	23.1	38	21	1.1	0.5–2.1	0.70	1.7	0.5–2.5	0.68	20	18.2	23	16.7	1.1	0.5–2.1	0.75	1.2	0.5–2.6	0.57
	No	60	76.9	143	79.0	1.0			1.0			90	81.8	115	83.3	1.0			1.0
Number of times in the day you inject yourself	≥4	36	46.2	60	36.8	1.4	0.8–2.5	0.16	2.0	1.1–3.6	0.01	83	75.5	61	44.5	3.8	2.2–6.6	<0.001	2.5	1.4–4.2	0.001
	1–3	42	53.8	103	63.2	1.0			1.0			27	24.5	76	55.5	1.0			1.0
You have gifted or sold a used syringe to another person	Yes	39	47.6	85	46.4	1.0	0.6–1.7	0.86	1.1	0.5–2.3	0.64	60	54.1	65	46.8	1.3	0.1–2.2	0.25	1.0	0.5–2.0	0.87
	No	43	52.4	98	53.6	1.0			1.0			51	45.9	74	53.2	1.0			1.0
Frequency with which you have used needles or syringes gifted, sold or rented by another person	Monthly	14	17.3	35	19.6	0.8	0.6–1.7	0.54	0.4	0.1–1.3	0.16	21	19.1	25	18.1	1.8	0.8–3.3	0.15	1.8	0.5–6.5	0.32
	Weekly	4	4.9	15	8.4	0.5	0.1–1.6	0.29	0.3	0.0–1.8	0.20	25	22.7	22	15.9	2.2	1.1–4.4	0.02	2.0	0.5–7.1	0.25
	Daily	7	8.6	16	8.9		0.3–2.2	0.88	0.3	0.0–1.7	0.20	24	21.8	12	8.7	3.9	1.7–8.7	<0.01	4.5	1.0–7.1	0.04
	Not applicable	56	69.1	113	63.1	1.0			1.0			40	36.4	79	57.2	1.0			1.0
HIV status
HIV serological status	Positive	4	4.9	3	1.6	3.0	0.6–14.0	0.14	1.1	0.1–6.9	0.89	14	12.6	7	5	2.7	1.0–6.9	0.03	2.7	0.9–8.5	0.07
	Negative	78	95.1	180	98.4	1.0			1.0			97	87.4	132	95	1.0			1.0