Table 1.
Overview of subject characteristics from the primary study cohort
| All Subjects | Nonsmokers | Cigarette Smokers | E-Cigarette Users | Significance Across Smoking Status* | |
|---|---|---|---|---|---|
| Total n | 44 | 14 | 13 | 17 | |
| Sex | |||||
| Male | 24 (57.1) | 7 (50.0) | 5 (38.5) | 12 (70.1) | 0.36 |
| Female | 20 (42.9) | 7 (50.0) | 8 (61.5) | 5 (29.9) | 0.36 |
| Race | |||||
| White | 28 (63.6) | 10 (71.4) | 7 (53.8) | 11 (64.7) | 0.51 |
| Black | 10 (22.7) | 2 (14.3) | 6 (46.2) | 2 (11.8) | 0.51 |
| Asian | 4 (9.1) | 1 (7.1) | 0 (0.0) | 3 (17.6) | 0.51 |
| Other | 2 (4.5) | 1 (7.1) | 0 (0.0) | 1 (5.9) | 0.51 |
| Race dichotomized | |||||
| White | 28 (63.6) | 10 (71.4) | 7 (53.8) | 11 (64.7) | 0.82 |
| Non-White | 16 (36.4) | 4 (28.6) | 6 (46.2) | 6 (35.3) | 0.82 |
| Ethnicity | |||||
| Non-Hispanic | 39 (88.6) | 11 (78.6) | 13 (100.0) | 15 (88.2) | 0.38 |
| Hispanic | 5 (11.4) | 3 (21.4) | 0 (0.0) | 2 (11.8) | 0.38 |
| Age, yr | 28 [18–47] | 29 [21–39] | 29.8 [22–47] | 26 [18–38] | 0.12 |
| BMI, kg/m2 | 29.1 [18.7–43.7] | 27.7 [20.0–37.7] | 29.2 [20.9–40.4] | 30.4 [21.7–43.7] | 0.55 |
| Cotinine, pg/mL | 103.5 [0–593.6] | 0 [0–0] | 181.4 [57.2–593.6] | 129.0 [0–288.8] | 8.35E-05 |
| Prior cigarette smoking | 25 (56.8) | 0 (100) | 13 (100) | 12 (70.5) | 1.71E-05 |
Values include the overall count (% of total) for all rows except age, BMI, and cotinine, which represent the overall average [min–max]. *Significance derived from Fisher’s exact tests across categorical data, and ANOVA across continuous data comparing against smoking groups. BMI, body mass index.