Table 1.
Dependent variables across time.
| Wave 1 | Wave 2 | Wave 3 | Wave 4 | Wave 5 | |
|---|---|---|---|---|---|
| n (%) | n (%) | n (%) | n (%) | n (%) | |
| Device type | |||||
| Disposable | 3 (4.2%) | 1 (1.4%) | 3 (4%) | 4 (5.5%) | 4 (5.4%) |
| Rechargeable | 54 (75%) | 61 (83.6%) | 63 (84%) | 61 (83.6%) | 61 (82.4%) |
| Both | 15 (20.8%) | 11 (15.1%) | 9 (12%) | 8 (10.9%) | 9 (12.2%) |
| Combustible tobacco product usea | 56 (77.8%) | 49 (69%) | 52 (69.3%) | 47 (64.4%) | 44 (59.5%) |
| Mean (SD) | Mean (SD) | Mean (SD) | Mean (SD) | Mean (SD) | |
|---|---|---|---|---|---|
| Days-disposable | 1.8 (5.6) | 1.0 (3.8) | 1.4 (4.7) | 1.8 (6.0) | 1.2 (4.2) |
| Days-rechargeable | 14.1 (11.4) | 14.7 (11.9) | 15.7 (11.9) | 15.6 (12.3) | 13.9 (12.4) |
| Nicotine dependenceb | 1.04 (1.2) | 1.1 (1.2) | 1.2 (1.2) | 1.2 (1.2) | 1.3 (1.2) |
a
Past 30-day use of cigarettes, cigar products, or hookah.
b
Nicotine dependence is measured on a scale from 0 to 3, a higher score indicates more symptoms of nicotine dependence.