Table 6.

Number of positive and negative consequences on simultaneous use days compared with cannabis-only days

Variable	No. of negative consequences		No. of positive consequences
	ERR	[95% CI]	ERR	[95% CI]
Level 1
Intercept	1.28	[0.89, 1.83]	3.19	[2.56, 3.97]**
Simultaneous use (vs. cannabis only)	1.98	[1.53, 2.55] **	1.39	[1.20, 1.62] **
Weekend (vs. weekday)	0.87	[0.75, 1.01]	1.05	[0.94, 1.18]
Study day (1–30)	0.99	[0.98, 1.01]	1.00	[0.99, 1.01]
Level 2
Age	0.99	[0.91, 1.83]	0.94	[0.88, 1.01]
Male (vs. female)	1.07	[0.69, 1.68]	0.97	[0.74, 1.28]
Mean simultaneous use days	0.63	[0.32, 1.23]	1.13	[0.74, 1.74]

Notes: No. = number; ERR = event rate ratio; CI = confidence interval. Bold indicates the effects of interest when significant. Nicotine use and other drug use were not included in the model because they rarely occurred on cannabis-only days (i.e., no variability in this predictor). Day type is coded 1 = simultaneous use, 0 = cannabis-only use; sex is coded 0 = female, 1 = male; weekend is coded 0 = Sunday–Thursday, 1 = Friday or Saturday.

^**p < .001.