Table 4.

Any drug use, by condition and time point

Prevalence		Control*	Intervention*	Odds Ratio	95% CI OR	Risk Differenceb	95% CI RD	Relative Risk	95% CI RR
Any drug use by	3 month	0.52	0.53	1.03	0.69 – 1.55	0.008	−0.09 – 0.11	1.02	0.84 – 1.23
self-report (TLFB)	6 month	0.49	0.48	0.95	0.63 – 1.43	−0.014	−0.12 – 0.09	0.97	0.79 – 1.20
	Combined	0.60	0.61	1.04	0.69 – 1.57	0.009	−0.09 – 0.11	1.01	0.86 – 1.19
Any MJ use by	3 month	0.52	0.52	1.03	0.70 – 1.52	0.007	−0.09 – 0.10	1.01	0.84 – 1.22
self-report (TLFB)	6 month	0.47	0.47	0.95	0.64 – 1.51	−0.003	−0.11 – 0.10	0.99	0.79 – 1.24
	Combined	0.59	0.60	1.07	0.72 – 1.59	0.015	−0.08 – 0.11	1.03	0.87 – 1.20
Urine analysis,	3 month	0.47	0.45	0.90	0.58 – 1.41	−0.025	−0.14 – 0.08	0.95	0.74 – 1.20
any drug use	6 month	0.47	0.45	0.94	0.62 – 1.42	−0.015	−0.12 – 0.09	0.97	0.77 – 1.21
	Combined	0.58	0.55	0.91	0.59 – 1.39	−0.024	−0.13 – 0.08	0.96	0.80 – 1.15
Urine analysis,	3 month	0.44	0.41	0.88	0.57 – 1.35	−0.031	−0.14 – 0.07	0.93	0.73 – 1.18
MJ drug use	6 month	0.43	0.41	0.92	0.61 – 1.39	−0.021	−0.12 – 0.08	0.95	0.75 – 1.21
	Combined	0.54	0.51	0.88	0.58 – 1.34	−0.031	−0.13 – 0.07	0.94	0.77 – 1.15
Hair analysis,	3 month	0.80	0.78	0.91	0.55 – 1.51	−0.015	−0.10 – 0.07	0.98	0.88 – 1.09
any drug use	6 month	0.72	0.71	0.96	0.59 – 1.54	−0.009	−0.11 – 0.09	0.99	0.86 – 1.13
	Combined	0.87	0.86	0.89	0.50 – 1.58	−0.014	−0.08 – 0.05	0.98	0.91 – 1.06
Hair analysis,	3 month	0.60	0.57	0.88	0.57 – 1.37	−0.030	−0.14 – 0.08	0.95	0.79 – 1.14
MJ drug use	6 month	0.59	0.56	0.89	0.59 – 1.33	−0.028	−0.13 – 0.07	0.95	0.80 – 1.13
	Combined	0.71	0.69	0.92	0.59 – 1.43	−0.018	−0.11 – 0.07	0.97	0.85 – 1.11

Note:

^*Proportion positive. MJ = marijuana.

^bRisk Difference calculated as Intervention – Control.