Table 2.
Grouping of puffs during 90 minutes of ad libitum access to electronic cigarettes
| Frequency of puff clusters | Average number of puffs per cluster | Percent of total puffs in session (%) | |||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
|
|
|||||||||||
| Subject | 1 puff | 2–5 puffs | 6–10 | >10 puffs | 2–5 puffs | 6–10 puffs | >10 puffs | 1 puff | 2–5 puffs | 6–10 puffs | >10 puffs |
| A. Tank e-cigarettes | |||||||||||
| 1 | 11 | 7 | 1 | 0 | 2.6 | 8.0 | 0 | 29.7 | 48.6 | 21.6 | 0 |
| 3 | 1 | 6 | 4 | 2 | 2.8 | 6.5 | 15.0 | 1.2 | 20.2 | 31.0 | 35.7 |
| 5 | 2 | 7 | 7 | 2 | 3.6 | 7.4 | 22.0 | 1.6 | 20.3 | 42.3 | 35.8 |
| 6 | 6 | 10 | 1 | 2 | 2.8 | 7.0 | 20.5 | 7.3 | 34.1 | 8.5 | 50.0 |
| 7 | 0 | 9 | 6 | 3 | 2.8 | 7.3 | 17.3 | 0 | 20.7 | 36.4 | 43.0 |
| 10 | 11 | 7 | 0 | 0 | 2.1 | 0 | 0 | 42.3 | 57.7 | 0 | 0 |
| 12 | 5 | 13 | 3 | 1 | 2.8 | 9.7 | 28.0 | 5.1 | 36.7 | 29.6 | 28.6 |
| 13 | 2 | 23 | 2 | 0 | 2.3 | 8.0 | 0 | 2.8 | 74.6 | 22.5 | 0 |
| B. Cartridge e-cigarettes | |||||||||||
| 2 | 12 | 8 | 3 | 0 | 2.8 | 8.7 | 0 | 20.0 | 36.7 | 43.3 | 0 |
| 9 | 0 | 3 | 0 | 0 | 3.3 | 0 | 0 | 0 | 100 | 0 | 0 |
| C. Rebuildable atomizers (RBAs) | |||||||||||
| 4 | 12 | 9 | 0 | 0 | 2.3 | 0 | 0 | 36.4 | 63.6 | 0 | 0 |
| 8 | 0 | 0 | 1 | 0 | 0 | 10.0 | 0 | 0 | 0 | 100 | 0 |
| 11 | 6 | 10 | 3 | 1 | 3.1 | 6.3 | 15.0 | 8.5 | 43.7 | 26.8 | 21.1 |
|
| |||||||||||
| Mean | 5.2 | 8.6 | 2.4 | 0.8 | 2.6 | 6.1 | 9.1 | 11.9 | 42.9 | 27.8 | 16.5 |
| Median | 5 | 8 | 2 | 0 | 2.8 | 7.3 | 0 | 5.1 | 36.7 | 26.8 | 0 |
| SD | 4.8 | 5.4 | 2.3 | 1.1 | 0.9 | 3.6 | 10.7 | 15.0 | 26.6 | 26.6 | 19.7 |
| Q1 | 1 | 7 | 1 | 0 | 2.3 | 6.3 | 0 | 1.2 | 20.7 | 8.5 | 0 |
| Q3 | 11 | 10 | 3 | 2 | 2.8 | 8.0 | 17.3 | 20.0 | 57.7 | 36.4 | 35.7 |
Note: Subject IDs correspond to subject IDs in a previously published study (reference 6); SD, standard deviation; Q1, first quartile; Q3, third quartile.