Table 4.

Adjusted odds ratios and 95 % confidence intervals for injecting risk behaviors in the two cities visited for the longest duration (prior 3 months)

Characteristic	Injecting status (yes/no)			Ancillary equipment sharing (yes/no)			Receptive needle sharing (yes/no)
	Among all city visits with a city name recorded (n = 350)			Among city visits in which the participant reported injecting and had a city name recorded (n = 200)
	Odds ratio	95 % confidence intervals	p value	Odds ratio	95 % confidence intervals	p value	Odds ratio	95 % confidence intervals	p value
Gender
Male	1.00			1.00			1.00
Female	1.11	(0.52, 2.40)	0.78	2.19	(0.86, 5.59)	0.10	2.56	(1.16, 5.66)	0.02
Transgender/other	6.35	(0.76, 52.95)	0.09	4.58	(1.04, 20.17)	0.04	0.81	(0.09, 7.15)	0.85
Age
≥25 years	1.00			1.00			1.00
20–24 years	0.63	(0.31, 1.29)	0.21	0.63	(0.23, 1.76)	0.38	0.68	(0.29, 1.62)	0.39
≤19 years	0.66	(0.23, 1.89)	0.44	0.99	(0.32, 3.06)	0.98	0.69	(0.22, 2.16)	0.52
Race/ethnicity
White	1.00			1.00			1.00
Race other than white	0.67	(0.28, 1.64)	0.38	0.19	(0.06, 0.55)	<0.01	0.50	(0.15, 1.65)	0.25
Population
<50,000	1.00			1.00			1.00
50,000–500,000	0.96	(0.47, 1.94)	0.91	1.77	(0.57, 5.46)	0.32	1.98	(0.41, 9.53)	0.39
>500,000–1,000,000	3.71	(1.56, 8.82)	<0.01	7.05	(2.25, 22.06)	<0.01	5.73	(1.17, 27.95)	0.03
>1,000,000	1.25	(0.40, 3.86)	0.70	3.84	(0.93, 15.84)	0.06	2.64	(0.45, 15.45)	0.28
Syringe exchange program available	1.78	(0.90, 3.52)	0.10	0.58	(0.23, 1.46)	0.25	0.86	(0.37, 2.04)	0.74
Alcohol use in this city
None	1.00			1.00			1.00
Non-daily	1.16	(0.61, 2.20)	0.66	3.37	(1.42, 7.68)	<0.01	1.19	(0.45, 3.13)	0.72
Daily/almost daily	1.21	(0.64, 2.26)	0.56	3.03	(1.32, 6.97)	<0.01	1.42	(0.58, 3.44)	0.44
Number of travel partners who were also injecting partners (prior 3 months)
0	1.00			1.00			1.00
1	1.46	(0.74, 2.89)	0.28	2.30	(0.84, 6.28)	0.10	1.61	(0.59, 4.39)	0.35
>1	2.77	(1.46, 5.27)	<0.01	1.51	(0.60, 3.84)	0.38	1.65	(0.66, 4.12)	0.28