Table 1.
Descriptive Statistics for the Total Sample and by Class
| Variable | Total | Class 1 | Class 2 | Class 3 | Class 4 |
|---|---|---|---|---|---|
| Sex, n (%) | |||||
| Male | 923 (50.3) | 135 (52.1) | 68 (53.1) | 138 (44.1) | 582 (51.3) |
| Female | 912 (49.7) | 124 (47.9) | 60 (46.9) | 175 (55.9) | 553 (48.7) |
| White, n (%) | |||||
| Yes | 1,335 (72.8) | 172 (66.4) | 101 (78.9) | 261 (83.4) | 801 (70.6) |
| No | 500 (27.2) | 87 (33.6) | 27 (21.1) | 52 (16.6) | 334 (29.4) |
| Black, n (%) | |||||
| Yes | 265 (14.4) | 47 (18.1) | 15 (11.7) | 29 (9.3) | 174 (12.3) |
| No | 1,570 (85.6) | 212 (81.9) | 113 (88.3) | 284 (90.7) | 961 (84.7) |
| Other, n (%) | |||||
| Yes | 235 (12.8) | 31 (12.0) | 11 (8.6) | 29 (9.3) | 164 (14.4) |
| No | 1,600 (87.2) | 228 (88.0) | 117 (91.4) | 284 (90.7) | 971 (85.6) |
| Hispanic, n (%) | |||||
| Yes | 381 (20.8) | 91 (35.1) | 19 (14.8) | 59 (18.8) | 212 (18.7) |
| No | 1,454 (79.2) | 168 (49.9) | 109 (85.2) | 254 (81.2) | 923 (81.3) |
| Household e-cigarette use, n (%) | |||||
| Yes | 233 (12.7) | 59 (22.8) | 26 (20.3) | 43 (13.7) | 105 (9.2) |
| No | 1,602 (87.3) | 200 (77.2) | 102 (79.7) | 270 (86.3) | 1,030 (90.8) |
| Cigars, n (%) | |||||
| Yes | 97 (5.3) | 45 (17.4) | 29 (22.7) | 9 (2.9) | 14 (1.2) |
| No | 1,738 (94.7) | 214 (82.6) | 99 (77.3) | 304 (97.1) | 1,121 (98.8) |
| Combustible cigarettes, n (%) | |||||
| No | 1,711 (93.2) | 195 (75.3) | 102 (79.7) | 300 (95.8) | 1,114 (98.2) |
| Yes | 124 (6.8) | 64 (24.7) | 25 (20.3) | 13 (4.2) | 21 (1.8) |
| Alcohol, n (%) | |||||
| No | 1,532 (83.4) | 160 (61.8) | 60 (46.9) | 258 (82.4) | 1,053 (92.8) |
| Yes | 304 (16.6) | 99 (38.2) | 68 (53.1) | 55 (17.6) | 82 (7.2) |
| Peer e-cigarette use, mean (SD) | 0.69 (1.75) | 1.93 (2.76) | 1.65 (2.36) | 0.66 (1.55) | 0.31 (1.16) |
| Perceived benefits of e-cigarette use, mean (SD) | 12.79 (5.83) | 15.97 (5.47) | 15.19 (5.67) | 13.61 (5.19) | 11.57 (5.70) |
| Depressive symptoms, mean (SD) | 18.29 (9.38) | 19.96 (11.65) | 21.08 (10.82) | 19.90 (8.74) | 17.15 (8.59) |
| E-cigarette positive expectations, mean (SD) | 6.57 (4.38) | 10.44 (4.20) | 9.65 (4.48) | 6.88 (4.16) | 5.25 (3.71) |
| Sensation seeking, mean (SD) | 13.94 (7.11) | 16.67 (7.05) | 19.58 (6.00) | 15.23 (6.72) | 12.34 (6.75) |
Notes: Covariate values are as follows: Sex (1=female), Race dummy coded with White as reference group (Black, 0=No 1=Yes; Other, 0=No 1=Yes), Ethnicity (0=Hispanic, 1=Non-Hispanic), Cigarette smoking (0=Never, 1=Ever), Alcohol use (past 6 months, 0=No 1=Yes), Cigar smoking (past 6 months, 0=No 1=Yes). Possible score range for following variable in parentheses: peer e-cigarette use (0‒9), perceived benefits of e-cigarette use (0‒36), e-cigarette positive expectations (0‒27), depressive symptoms (0‒60), sensation seeking (0‒32).