TABLE 1.
Demographicsa
| Normal volunteers (n = 20) |
| Sex Male (n = 11) |
| Female (n = 9) |
| Ethnicity Black non-Hispanic (n = 9) |
| Black Hispanic (n = 5) |
| White non-Hispanic (n = 2) |
| White Hispanic (n = 1) |
| Asian (n = 1) |
| Mixed/other (n = 2) |
| Mean age (SEM) 41 (2.3) |
| Alcohol KMSK scoreb: median (IQR) 4 (2–8.5) |
| Tobacco KMSK scoreb: median (IQR) 0 (0–4.5) |
Abbreviations:
IQR: interquartile range; KMSK: Kreek–McHugh–Schluger–Kellogg scale (measuring maximum lifetime exposure to drugs); SEM, standard error of the mean.
a
Missing KMSK scores for n = 3.
b
KMSK scales are ordinal integer measures of maximal self-exposure to each drug, for the period in a persons’ life when use was the heaviest. A score of “0” indicates no lifetime use of the drug; the maximum scores for alcohol and tobacco is 13 (Butelman et al., 2018; Kellogg et al., 2003; Tang et al., 2011).