TABLE 2.

Cocaine use among head and neck cancer cases and controls in the INHANCE consortium, by study.

	Seattle		Los Angeles		Houston
	Cases n (%) a	Controls n (%) a	Cases n (%) a	Controls n (%) a	Cases n (%) a	Controls n (%) a
Total	392	608	425	1033	822	865
Cocaine use
Never	359 (91.6)	556 (91.5)	371 (87.3)	976 (94.5)	819 (99.6)	857 (99.1)
Ever	33 (8.4)	52 (8.5)	54 (12.7)	57 (5.5)	3 (0.4)	8 (0.9)
0–30 times	19 (4.9)	31 (5.1)	28 (6.6)	37 (3.6)	0	2 (0.2)
30–100 times	1 (0.3)	4 (0.7)	10 (2.4)	7 (0.7)	0	0
More than 100 times	13 (3.3)	17 (2.8)	16 (3.8)	13 (1.3)	3 (0.4)	6 (0.7)

^a Percentages may not add up to 1 due to rounding.