Surveying alcohol and other drug use through telephone sampling: a comparison of landline and mobile phone samples

Table 2 Relationship between telephone status, drinking, cannabis use and smoking

	Adjusted odds ratio for mobile-only subsample (compared to landline sample)	95% Confidence interval
Total drinking volume⁺	1.15	(0.88-1.51)
Risky drinking	0.90	(0.62-1.29)
Very risky drinking	1.11	(0.76-1.62)
Lifetime cannabis use	1.55	(1.09-2.20)*
Recent cannabis use	2.36	(1.30-4.30)*
Current smoking	2.43	(1.65-3.57)*

Controlling for age, sex, location and education status.
* statistically significant at p < 0.05.
⁺ Note that the model for total volume was a negative binomial regression model, and the parameter presented here for it is an Incident Rate Ratio rather than an Odds Ratio.