Table 1.

Characteristics of past-year marijuana users based on marijuana use frequency in a sample of the US school population of 8th and 10th graders (N= 57,767): data from 2012 and 2013 Monitoring The Future.

	No use (0 occasion) (N=45,862)	Occasional use (1–9 occasions) (N=7,160)		Frequent use (10–39 occasions) (N=2,524)		Regular use (≧40 occasions) (N=2,221)
	%	%	OR (95% CI)	%	OR (95% CI)	%	OR (95% CI)
Sex
Male	48.1	48.2	1.00	52.6	1.00	69.1	1.00
Female	51.9	51.8	0.99(0.91,1.09)	47.4	0.83(0.75,0.93)+	30.9	0.41(0.36,0.48)±
Grade level
8th	56.8	35.7	1.00	26.0	1.00	26.0	1.00
10th	43.2	64.4	2.37(2.01,2.79)±	74.0	3.75(2.86,4.92)±	74.0	4.93(3.53,6.90)±
Race
White	67.1	59.3	1.00	62.3	1.00	66.8	1.00
Black	13.2	15.0	1.28(1.02,1.61)*	13.4	1.10(0.79,1.53)	12.0	0.91(0.66,1.26)
Hispanic	19.8	25.7	1.47(1.14,1.91)*	24.4	1.33(0.56,1.85)	21.3	1.08(0.83,1.41)
Region
Northeast	18.5	17.4	1.00	20.2	1.00	17.0	1.00
Northcentral	24.1	20.2	0.89(0.78,1.01)	20.0	0.76(0.67,0.86)+	22.3	1.00(0.85,1.18)
South	35.1	36.5	1.10(0.95,1.28)	34.3	0.89(0.72,1.10)	36.4	1.12(0.78,1.62)
West	22.3	25.9	1.23(1.11,1.37)+	25.4	1.04(0.89,1.22)	24.3	1.18(0.89,1.22)
Gang Fight
No	88.4	79.0	1.00	67.4	1.00	51.5	1.00
Yes	11.6	21.0	2.73(2.41,3.09)±	32.6	3.40(2.99,3.87)±	48.5	5.06(3.69,6.93)±
Attacked Others
No	91.0	79.7	1.00	74.7	1.00	87.8	1.00
Yes	9.0	20.3	2.56(1.96,3.47)±	25.3	3.42(2.73,4.28)±	12.2	6.30(4.28,8.25)±
Trespassed buildings
No	84.4	63.9	1.00	55.0	1.00	52.2	1.00
Yes	15.6	36.2	3.06(2.66,3.53)±	45.0	4.42(3.66,5.36)±	47.8	4.96(3.98,6.17)±
Stole things worth >$50
No	96.1	87.2	1.00	79.4	1.00	69.2	1.00
Yes	3.9	12.8	3.60(3.16,4.09)±	20.6	6.37(4.62,8.78)±	30.8	10.94(7.92,15.11)±
Sold drugs
No	99.0	89.3	1.00	68.2	1.00	46.1	1.00
Yes	1.0	10.7	12.78(5.19,11.00)±	31.8	49.82(35.89,69.16)±	53.9	124.88(79.45,196.30)±

^*p<0.05,

⁺p <0.01,

^±p< 0.001