Table 1.

Univariate associations with receptive syringe sharing among injection drug users in Mexico.

	Total (n = 426)	Shared syringes (n = 302)	Did not share syringes (n = 124)	P-value
Demographics
Median age in years (IQR)	34 (28–40)	33 (28–39)	36 (32–43)	0.001
Male	92.0	93.1	89.5	0.222
Never married	59.1	61.1	54.0	0.176
Completed high school	29.8	29.5	30.7	0.810
City of residence
Tijuana	51.9	55.6	42.7
Ciudad Juarez	48.1	44.4	57.3	0.016
Homeless (past 6 months)	43.0	50.3	25.0	< 0.001
Lived/worked outside Mexico (past 10 years)	35.3	39.2	25.8	0.009
Crossed the US border (past 6 months)	13.6	13.3	14.2	0.818
Drug use (past 6 months)
Smoked marijuana	50.5	53.7	42.6	0.039
Used oral tranquilizers	33.3	37.7	22.8	0.003
Smoked methamphetamine (meth)	26.3	28.1	22.0	0.193
Injected drugs
Any meth	36.9	43.1	21.5	< 0.001
Meth and heroin	34.4	40.3	19.8	< 0.001
Meth alone	23.2	28.5	10.5	< 0.001
Any cocaine	49.1	52.5	40.5	0.026
Cocaine and heroin	44.5	47.5	37.2	0.055
Cocaine alone	30.6	33.9	22.6	0.022
Heroin alone	97.4	97.4	97.6	0.892
Injected daily (any drugs)	79.3	82.0	72.7	0.033
Injection locations (past 6 months)
IDU's home	51.3	48.0	59.4	0.034
Someone else's home	37.2	42.4	24.4	< 0.001
Shooting gallery	60.5	71.5	33.3	< 0.001
Construction site	26.8	31.1	16.3	0.002
Alleyway	28.0	33.4	14.6	< 0.001
On the street	37.2	44.0	20.3	< 0.001
Arrest history
Ever arrested	93.2	95.0	88.7	0.019
Ever arrested for carrying unused syringes	47.8	55.0	30.1	< 0.001
Arrest within the past 6 months	78.9	80.9	70.3	0.154
Median number of arrests (IQR)	5 (3–10)	5 (3–10)	4 (2–10)	0.023
Ever arrested for carrying used syringes	57.1	67.2	32.0	< 0.001
Arrest within the past 6 months	78.3	80.6	66.7	0.054
Median number of arrests (IQR)	5 (3–10)	5 (3–11)	5 (3–10)	0.251

IQR: interquartile range.