. Author manuscript; available in PMC: 2020 Sep 16.

Published in final edited form as: Alcohol Clin Exp Res. 2019 May 21;43(7):1575–1584. doi: 10.1111/acer.14076

Table 1.

Sample characteristics

Measure	Mean ± SD	Range
Age	27.77 ± 4.20	21–35
Sex, n (%)	98 (68.0%) males/46 (31.9%) females
Race, n (%)	107 (74.3%) White/European American 37 (25.7%) Black/African American
Ethnicity, n (%)	3 (0.02%) Hispanic
ADHD history, n (%)	67 (46.5 %) ADHD/77 (53.5%) nonADHD
Alcohol use past 30 days
Frequency of drinking^a	2.63 ± 1.42	0–5
Frequency of 5+ drinks	2.79 ± 3.79	0–30
Sleep variables
Midsleep, mean	4:29 ± 1:25	1:59 – 8:46
Midsleep, variability (SD)	0:54 ± 0:28	0:10 – 2:24
Sleep duration, mean	7h 32m ± 1h 10m	4h 50m – 13h 23m
Sleep duration, variability (SD)	1h 21m ± 0h 43m	0h 10m – 4h 54m
Composite Scale of Morningness (CSM)^b	33.53 ± 9.14	14–52

NOTE:

Frequency of drinking was scored on an ordinal scale: 0 = not at all; 1=1–2 days; 2 =3–5 days, 3= 6–9 days; 4 =10–19 days; 5 =20–29 days; 6= all 30 days;

n=60