Table 4.

Bivariate and multivariate analysis results for Cúcuta and Bogota.

		Cucuta										Bogota
		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	%
Socioeconomic level	Low	33	73.3	114	69.1	1.2	0.5–2.5	0.58	1.2	0.4–3.3	0.66	7	53.8	86	47.8	1.2	0.4–3.9	0.6	2.6	0.5–12.0	0.21
	Medium-high	12	26.7	51	30.9	1.0			1.0			6	46.2	94	52.2	1.0			1.0
Age	20 years old or younger	10	22.2	44	26.7	1.0			1.0			1	7.7	19	10.6	1.0			1.0
	21 to 24 years old	15	33.3	37	22.4	1.7	0.7–4.4	0.21	2.5	0.7–8.4	0.13	2	15.4	58	32.2	0.6	0.0–7.6	0.73	1.8	0.0–56.3	0.71
	25 to 28 years old	8	17.8	31	18.8	1.1	0.4–3.2	0.81	0.6	0.1–3.2	0.63	7	53.8	45	25.0	2.9	0.3–25.7	0.32	8.8	0.3–206.2	0.17
	Over 28 years old	12	26.7	53	32.1	0.9	0.3–2.5	0.99	0.6	0.1–2.7	0.56	3	23.1	58	32.2	0.9	0.0–10.0	0.98	2.0	0.0–61.1	0.68
Years of injection drug use	1 or less	8	17.8	32	19.4	1.0			1.0			3	23.1	32	17.8	1.0			1.0
	2−4	21	46.7	76	46.1	1.1	0.4–2.7	0.83	1.3	0.3–4.4	0.66	3	23.1	59	32.8	0.5	0.1–2.8	0.46	1.4	0.1–11.6	0.69
	5 or more	16	35.6	57	34.5	1.1	0.4–2.9	0.81	1.7	0.4–6.9	0.44	7	53.8	89	49.4	0.8	0.2–3.4	0.80	0.9	0.1–6.1	0.93
injection behaviour during the previous 6 months
You have shared drug mix with another person, passing from one syringe to another	Yes	10	25.6	30	19.5	1.4	0.6–3.2	0.39	1.1	0.2–4.6	0.86	1	7.7	45	25.9	0.2	0.03–1.8	0.17	0.1	0.0–1.7	0.12
	No	124	80.5	29	74.4	1.0			1.0			12	92.3	129	74.1	1.0			1.0
You have shared cotton, rinsing water, or spoons.	Yes	17	38.6	47	29.7	1.4	0.7–2.9	0.26	1.6	0.5–4.9	0.33	7	53.8	101	56.1	0.9	0.2–2.8	0.87	0.9	0.2–4.5	0.17
	No	27	61.4	111	70.3	1.0			1.0			6	46.2	79	43.9	1.0			1.0
You have used water to clean needles and syringes previously used by another person	Yes	10	22.2	33	20	1.1	0.5–2.5	0.7	1.9	0.1–20.8	0.59	2	15.4	27	15	1.0	0.2–4.9	0.97	2.1	0.2–22.9	0.52
	No	35	77.8	132	80	1.0			1.0			11	84.6	153	85	1.0			1.0
You have obtained drug dose from a drug mix shared by others	Yes	8	18.6	30	18.4	1.0	0.4–2.4	0.97	0.5	0.1–2.6	0.48	9	69.2	113	63.5	1.2	0.3–4.3	0.67	3.0	0.6–15.7	0.17
	No	35	81.4	133	81.6	1.0			1.0			4	30.8	65	36.5	1.0			1.0
You have injected at an indoor site to which people go to inject drugs	Yes	34	77.3	121	74.7	1.1	0.5–2.5	0.72	1.1	0.3–3.4	0.77	7	53.8	70	39.1	1.8	0.5–5.6	0.30	1.5	0.3–7.0	0.58
	No	10	22.7	41	25.3	1.0			1.0			6	46.2	109	60.9	1.0			1.0
You have injected at an outdoor site to which people go to inject drugs	Yes	34	81	132	81.5	0.96	0.4–2.2	0.96	0.7	0.2–2.4	0.69	12	92.3	118	65.6	6.3	0.8–49.6	0.08	6.2	0.6–60.8	0.11
	No	8	19	30	18.5	1.0			1.0			1	7.7	62	34.4	1.0			1.0
You have been injected by someone that charges to inject drugs	Yes	9	20.5	13	8.2	2.8	1.1–7.2	0.02	1.5	0.3–6.1	0.55	0	0	2	1.1	0.0	0.0	0.99	0.0	0.0	0.99
	No	35	79.5	145	91.8	1.0			1.0			13	100	178	98.9	1.0			1.0
Number of times in the day you inject yourself	≥4	20	45.5	64	39	1.3	0.6–2.5	0.4	0.7	0.3–2.0	0.63	6	46.2	56	31.3	1.8	0.6–5.8	0.27	1.8	0.7–4.7	0.18
	1–3	24	54.5	100	61	1.0			1.0			7	53.8	123	68.7	1.0			1.0
You have gifted or sold a used syringe to another person	Yes	18	40	60	36.4	1.1	0.5–2.2	0.65	1.4	0.5–3.7	0.44	5	38.5	93	51.7	0.58	0.1–1.8	0.36	0.4	0.0–1.9	0.27
	No	27	60	105	63.6	1.0			1.0			8	61.5	87	48.3	1.0			1.0
Frequency with which you have used needles or syringes gifted, sold or rented by another person	Monthly	4	8.9	29	17.6	0.4	0.1–1.4	0.18	0.1	0.0–2-0	0.16	4	30.8	63	35	0.7	0.2–2.5	0.67	0.8	0.1–5.9	0.85
	Weekly	3	6.7	11	6.7	0.9	0.2–3.5	0.9	0.5	0.0–7.0	0.61	0	0	3	1.7	0.0	0.0	0.99	0.0	0.0	0.99
	Daily	4	8.9	8	4.8	1.7	0.4–6.0	0.39	1.5	0.1–22.9	0.75	0	0	5	2.8	0.0	0.0	0.99	0.0	0.0	0.99
	Not applicable	34	75.6	117	70.9	1.0			1.0			9	69.2	109	60.6	1.0			1.0
HIV status
HIV serological status	Positive	9	20	3	1.8	13.5	3.4–52.3	<0.001	16.9	3.5–81.5	<0.001	2	15.4	5	2.8	6.3	1.1–36.5	0.03	17.4	0.9–316.5	0.05
	Negative	36	80	162	98.2	1.0			1.0			11	84.6	175	97.2	1.0			1.0