. Author manuscript; available in PMC: 2012 Apr 1.

Published in final edited form as: Prev Sci. 2012 Apr;13(2):118–128. doi: 10.1007/s11121-011-0260-3

Table 1.

Descriptive statistics for study variables (N=499)

	N (%)	Mean (SD)	European American (N=211)		African American (N=288)		p
	N (%)	Mean (SD)	N (%)	Mean (SD)	N (%)	Mean (SD)	p
Covariates at age 11
Public assistance	130 (26.7)		26 (12.7)		64 (36.7)		^***
Conduct problems		.98 (1.7)		.78 (1.7)		1.13 (1.7)	^*
Impulsivity		1.98 (1.7)		1.63 (1.5)		2.23 (1.8)	^***
Menarche	139 (30.5)		44 (23.7)		95 (35.3)		^**
Rates of alcohol use
Age 12	77 (15.8)		39 (18.9)		38 (13.5)		ns
Age 13	91 (18.6)		54 (26.0)		37 (13.1)		^***
Age 14	135 (27.8)		84 (41.0)		51 (18.2)		^***
Age 15	157 (32.2)		90 (43.9)		67 (23.8)		^***
Age 16 risky sex behaviors
≥ 2 partners	57 (11.4)		19 (9.0)		38 (13.2)		ns
Inconsistent BC	102 (20.4)		32 (15.2)		70 (24.3)		^*
Pregnant	27 (5.4)		5 (2.4)		22 (7.6)		^**
STI	7 (1.4)		3 (1.4)		4 (1.4)		ns

p<.05,

^**

p<.01,

^***

p<.001.

BC Birth Control, STI Sexually Transmitted Infection