Table 2.

Main effects and odds ratios (with corresponding confidence intervals) comparing ED use groups in one central Virginia public school system in 2012.

	Main Effects						OR (98.33% CI) comparing ED use groups
Substance	Gender		Grade		ED group
χ2 value	Adjusted p-valuea	χ2 value	Adjusted p-valuea	χ2 value	Adjusted p-valuea	Light vs none	Moderate/heavy vs none	Moderate/heavy vs light
Alcohol	32.78	< 0.0001b	134.47	< 0.0001	191.27	< 0.0001	3.12 (2.47, 3.95)	4.33 (3.08, 6.09)	1.39 (0.97, 1.99)d
Cigarettes	5.91	0.1956	159.69	< 0.0001	196.31	< 0.0001	2.43 (1.93, 3.08)	5.42 (3.99, 7.38)	2.23 (1.62, 3.06)
Marijuana	0.66	1.0000	296.30	< 0.0001	167.76	< 0.0001	2.51 (1.98, 3.20)	4.76 (3.46, 6.55)	1.89 (1.36, 2.63)
LSD	10.89	0.0125c	67.46	< 0.0001	65.01	< 0.0001	1.86 (1.12, 3.06)	5.55 (3.33, 9.25)	2.99 (1.77, 5.05)
Cocaine	1.90	1.0000	27.94	< 0.0001	58.60	< 0.0001	3.12 (1.50, 6.49)	9.81 (4.76, 20.19)	3.15 (1.66, 5.97)
Inhalants	14.61	0.0017b	22.87	< 0.0001	84.05	< 0.0001	2.15 (1.56, 2.97)	4.06 (2.79, 5.92)	1.89 (1.30, 2.76)
Methamphetamine	0.29	1.0000	7.16	0.0970	38.95	< 0.0001	2.92 (0.97, 8.77)d	12.40 (4.48, 34.29)	4.24 (1.74, 10.35)
Amphetamines	1.65	1.0000	96.17	< 0.0001	89.87	< 0.0001	2.80 (1.97, 3.98)	4.69 (3.09, 7.11)	1.67 (1.12, 2.51)
Sedatives	14.20	0.0021b	16.50	0.0006	106.60	< 0.0001	1.75 (1.17, 2.62)	5.88 (3.88, 8.89)	3.35 (2.18, 5.15)
Tranquilizers	0.00	1.0000	62.70	< 0.0001	71.29	< 0.0001	2.53 (1.51, 4.24)	6.73 (3.92, 11.54)	2.66 (1.58, 4.46)
Prescription narcotics	0.41	1.0000	114.95	< 0.0001	82.06	< 0.0001	2.82 (1.88, 4.21)	5.41 (3.41, 8.57)	1.92 (1.23, 3.00)
Heroin	0.94	1.0000	4.41	0.4644	35.92	< 0.0001	2.47 (0.74, 8.30)d	12.35 (4.19, 36.38)	5.00 (1.85, 13.48)
Ecstasy	1.24	1.0000	64.33	< 0.0001	43.23	< 0.0001	3.39 (1.91, 6.02)	5.41 (2.83, 10.35)	1.60 (0.88, 2.89)d

^aBonferroni correction applied.

^bSignificantly more females than males.

^cSignificantly more males than females.

^dThe confidence interval contains the value 1, which suggests there is no difference between the two ED use groups.