Table 1.
Indices of demand for participants own e-cigarette and the study e-cigarette with the mouthpiece device and the results for Wilcoxon Singed Rank Tests.
| Metric | No Mouthpiece | Mouthpiece | Difference | Range | WRS | |||
|---|---|---|---|---|---|---|---|---|
| M ± SD | M ± SD | M | SD | Min | Max | z-value | p-value | |
| Intensity (mLs) | 10.72 ± 10.64 | 10.41 ± 18.80 | 0.31 | 11.22 | −46 | 25 | 14.5 | .658 |
| Intensity (puffs) | 118.88 ± 84.03 | 112.02 ± 88.95 | 6.86 | 27.43 | −50 | 100 | 28 | .119 |
| Pmax (mLs) | 4.37 ± 1.44 | 4.50 ± 8.46 | −0.13 | 6.60 | −32 | 13 | 110 | .083 |
| Pmax (puffs) | 0.91 ± 1.23 | 1.38 ± 1.87 | −0.47 | 1.85 | −5.1 | 4.5 | −57 | .337 |
| Omax (mLs) | 11.76 ± 14.67 | 9.22 ± 12.05 | 2.54 | 10.26 | −42 | 32 | 159 | .019 |
| Omax (puffs) | 21.68 ± 42.00 | 13.94 ± 16.58 | 7.74 | 34.24 | −23 | 174 | 69.5 | .240 |
| Breakpoint (mLs) | 12.62 ± 20.30 | 8.18 ± 16.70 | 4.44 | 12.92 | −14 | 72 | 138.5 | .003 |
| Breakpoint (puffs) | 4.58 ± 8.78 | 4.47 ± 6.20 | 0.10 | 5.58 | −14 | 21 | −20.5 | .631 |
| Elasticity (mLs) | 0.01 ± 0.01 | 0.03 ± 0.05 | −0.01 | 0.05 | −0.23 | 0.04 | −106.5 | .186 |
| Elasticity (puffs) | 0.02 ± 0.03 | 0.03 ± 0.07 | −0.01 | 0.05 | −0.22 | 0.03 | −74 | .308 |
Note. mLs = milliliters; M= Mean; SD = Standard deviation; Differences were calculated by subtracting the participant’s device score from his/her own score; Min = Minimum; Max = Maximum; Differences were calculated by subtracting the participant’s device score from his/her own score; WRS: Wilcoxon Signed Rank Test