Table 2.

Risk of testicular cancer associated with marijuana use - all histologies. Western Washington State, January 1999 – January 2006

	Controls (N=979)		Cases (N=369)
Characteristic	N	%	N	%	OR1	95% CI
Ever used marijuana
No	313	32.0	101	27.4	1.0	(ref)
Yes	666	68.0	268	72.6	1.3	1.0–1.8
Marijuana use as of reference date
Never	313	32.0	101	27.4	1.0	(ref)
Former	474	48.4	171	46.3	1.2	0.9–1.7
Current	192	19.6	97	26.3	1.7	1.1–2.5
Age at first use among current users
<18	143	14.6	76	20.6	1.8	1.2–2.8
18+	49	5.0	21	5.7	1.4	0.8–2.5
Years of use among current marijuana users
<10 years	44	4.5	27	7.3	1.8	1.0–3.32
10+ years	148	15.1	70	19.0	1.6	1.1–2.5
Frequency of current marijuana use
Daily or >=1 day a week	101	10.3	57	15.4	2.0	1.3–3.2
Less than once a week	91	9.3	40	10.8	1.4	0.9–2.3

¹Adjusted for age at reference date, reference year, alcohol use, current smoking, and history of cryptorchidism.

²Confidence interval excludes 1.0