Table 1.
Baseline characteristics
| Nonsmokers | EC Vapers | TC Smokers | P Value | |
|---|---|---|---|---|
| n | 47 | 49 | 40 | |
| Mean age, yr | 26.3 ± 5.20 | 27.4 ± 5.45 | 27.1 ± 5.51 | 0.53 |
| Sex, men/women | 22/25 | 36/13 | 26/14 | 0.02 |
| Mean BMI, kg/m2 | 23.5 ± 2.91 | 24.2 ± 3.58 | 24.7 ± 3.92 | 0.47 |
| Race, n | 0.60 | |||
| African American | 4 | 2 | 5 | |
| Caucasian | 26 | 29 | 25 | |
| Asian | 9 | 13 | 8 | |
| Hispanic | 5 | 5 | 2 | |
| Hawaiian | 2 | 0 | 0 | |
| Unknown | 1 | 0 | 0 | |
| Base cotinine, ng/mL* | 0 | 83.2 (17.6, 141.5) | 82.0 (34.6, 160.5) | 0.68† |
| Former TC smoker, n (%) | 2 (4.3) | 28 (57.1) | N/A | |
| SBP, mmHg | 118.2 ± 13.1 | 120.8 ± 11.0 | 118.0 ± 10.4 | 0.37 |
| DBP, mmHg | 74.7 ± 11.3 | 76.1 ± 10.9 | 73.6 ± 8.3 | 0.66 |
| MBP, mmHg | 88.3 ± 11.1 | 89.6 ± 9.9 | 86.9 ± 8.3 | 0.56 |
| HR, beats/min | 66.7 ± 9.5 | 63.9 ± 9.5 | 63.7 ± 8.5 | 0.23 |
| Peak shear rate, s−1* | 78,437 (58,340, 108,744) |
86,427 (50,760, 116,471) |
91,680 (965,953, 124,978) |
0.51 |
| Artery diameter, mm | 3.44 ± 0.47 | 3.74 ± 0.51 | 3.64 ± 0.57 | 0.008 |
Values are means ± SD. BMI, body mass index; DBP, diastolic blood pressure; EC, electronic cigarette; HR, heart rate; MBP, mean blood pressure; SBP, systolic blood pressure; TC, tobacco cigarette; N/A, not applicable.
*
Median, Q1–Q3.
†
P value, EC vapers vs. TC smokers.