. 2017 Feb 7;28(3):1049–1063. doi: 10.1093/cercor/bhx014

Table 1.

Demographic characteristics of adolescent study groups for those meeting no/low alcohol use history (AUH) criteria and those exceeding criteria for at-risk alcohol consumption: n = subject count; mean ± standard deviation (SD) (range); significant P-values are marked in italic

		No/low AUH	Matched groups		Difference between matched groups; P =
		No/low AUH	Exceeds-criteria group	Matched no/low AUH subgroup	Difference between matched groups; P =
n	Total	581	117	117
	Girls/boys	306/275	62/55	62/55	1.0^a
	GE/Siemens	385/196	80/37	72/45	0.27^a
Age (years)		15.9 ± 2.3 (12–21.9)	18.6 ± 1.9 (13–1.9)	18.4 ± 1.8 (13–21.9)	0.39
PDS^b		3.2 ± 0.7 (1–4)	3.7 ± 0.4 (1.8–4)	3.6 ± 0.4 (2.2–4)	0.28
Alcohol use	Days lifetime	1.1 ± 4.2	51.6 ± 75.8	3.1 ± 7.2	<0.001
	Days past year	0.0±2.9	23.7 ± 31.9	1.8 ± 4.9	<0.001
	Max drinks^c	0.4±0.9	7.6 ± 4.7	0.8 ± 1.2	<0.001
	Binges past year	0	12.2 ± 12.2	0	0.004
Marijuana use	Days lifetime	0.6 ± 2.5	10.8 ± 17.7	1.0 ± 3.9	0.004
Marijuana use	Days past year	0.3 ± 1.6	7.5 ± 16.0	0.6 ± 2.5	0.015
Parental education (years)		16.9 ± 2.4 (6–20)	17.4 ± 2 (12–20)	17.0 ± 2 (11–20)	0.19
Highest grade		9.2 ± 2.4 (5–15)	11.9 ± 1.9 (6–16)	11.8 ± 1.9 (7–15)	0.66
WRAT^d	Reading	116 ± 17 (80–145)	113 ± 14 (85–145)	114 ± 14 (84–145)	0.83
WRAT^d	Writing	112 ± 16 (66–145)	113 ± 14 (72–143)	113 ± 167 (75–145)	0.73

^aChi-square test.

^bScore ranges between 1 = “puberty not started” and 4 = “puberty completed.”

^cMaximum number of drinks at one occasion in the past year.

^dWide Range Achievement Test (WRAT): standard scores are reported with an expected mean ± SD of 100 ± 15.