Table 2.

Association between cannabis use and number of times used opioids in past 30 days, among people who inject opioids in Los Angeles and San Francisco, 2011–2013 (N=652)

Independent Variables	Beta	95% C.I.
Explanatory Variable
Cannabis use past 30 days	−0.346	(−0.575, −0.116)*
Confounding Variables
Latino	0.350	(0.087, 0.613)*
Los Angeles	0.636	(0.377, 0.895)*
30 to 39 years old	0.628	(0.264, 0.991)*
Age at first injection	−0.015	(−0.028, −0.002)*
No health insurance	0.113	(−0.143, 0.369)
In substance abuse treatment past 30 days	−0.197	(−0.443, 0.048)

^*p-value <0.05.

Beta coefficients were derived from OLS estimation procedure on the log-transformed variable