Table 3.

Prevalence Rates of Substance Use in the Past 3 Weeks.

	%(f)
	Time 1	Time 2	Time 3	Time 4
Alcohol Use
Total Sample	31.1(293)	44.2(152)	38.9(199)	45.4(221)
High School Students	25.1(99)	42.4(61)	30.5(67)	36.1(78)
Transitioners	34.3(136)	41.3(59)	37.0(61)	50.6(81)
Graduates	37.7(57)	56.1(32)	56.5(48)	55.4(46)
Binge Drinking
Total Sample	9.4(88)	20.8(71)	17.8(91)	18.6(91)
High School Students	6.1(24)	18.8(27)	10.5(23)	11.0(24)
Transitioners	12.2(48)	22.4(32)	20.6(34)	24.8(40)
Graduates	10.7(16)	21.8(12)	29.4(25)	22.9(19)
Cannabis Use
Total Sample	14.1(132)	18.0(62)	17.4(89)	20.4(100)
High School Students	11.2(44)	11.8(17)	11.3(25)	16.1(35)
Transitioners	14.9(59)	19.6(28)	23.0(38)	22.5(36)
Graduates	19.2(29)	29.8(17)	20.0(17)	27.7(23)
E-Cigarette Use
Total Sample	9.6(90)	11.4(39)	14.3(73)	14.5(70)
High School Students	8.4(33)	9.0(13)	15.8(35)	16.8(36)
Transitioners	10.5(41)	13.4(19)	14.0(23)	10.6(17)
Graduates	10.7(16)	12.3(7)	10.6(9)	12.2(10)