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Table 1 Baseline characteristics of participants (n = 248)

From: Medium- and longer-term cardiovascular effects of e-cigarettes in adults making a stop-smoking attempt: a randomized controlled trial

Baseline characteristics Nicotine replacement therapy (NRT), n = 82 Nicotine-containing e-cigarettes, n = 84 Nicotine-free e-cigarettes, n = 82
Sex, %male 44% 55% 50%
Age, mean years (SD) 44 (13) 44 (14) 44 (13)
BMI, Mean (SD) 26.5 (5.1) 27.5 (5.9) 27.4 (5.4)
Systolic blood pressure, mmHg (SD) 132 (17) 132 (18) 131 (18)
Diastolic blood pressure, mmHg (SD) 81 (12) 83 (12) 82 (14)
MAP, mean mm Hg (SD) 98 (11) 98 (11) 97 (12)
Smoking tears, mean (SD) 25(13) 24 (13) 25 (13)
Cigarettes per day, mean (SD) 18 (7) 18 (7) 16 (7)
Smoking pack years, mean (SD) 24 (19) 23 (17) 22 (17)
Exhaled air carbon monoxide (CO), mean parts per million (SD) 16.9 (6.9) 15.2 (7.9) 14.3 (8.1)
Physical activity, mean weekly MET minutes (SD) 2756 (2627) 2772 (2669) 3082 (3191)
%FMD, mean (SD) 6.7 (4.0) 6.2 (4.4) 5.6 (3.6)
Artery diameter (pre-inflation), mean (SD) 4.22 (0.66) 4.13 (0.65) 4.10 (0.56)
Artery diameter (post-inflation), mean (SD) 4.47 (0.64) 4.34 (0.61) 4.36 (0.55)
Peak CVC for ACh, mean PU/mmHg (SD) 1.34 (1.00) 1.48 (1.02) 1.49 (0.98)
Peak CVC for SNP, mean PU/mmHg (SD) 1.35 (0.98) 1.45 (1.02) 1.15 (0.72)
Total cholesterol, mmol/l (SD) 4.4 (1.0) 4.5 (1.1) 4.7 (1.2)
Total cholesterol/HDL ratio (SD) 4.4 (1.9) 4.1 (1.7) 4.1 (1.9)
FTND, points (SD) 6 (2) 6 (2) 6 (2)
Q-Risk, % (SD) 7.5 (8.7) 8.6 (10) 7.8 (9.1)
Q-Risk – Heart Health, years (SD) 53 (16) 54 (16) 54 (15)
  1. ACh, acetylcholine; BMI, body mass index; CVC, peak cutaneous vascular conductance; %FMD, percentage change in flow-mediated dilation; FTND, Fagerstrom Test for Nicotine Dependence; HDL, high-density lipoprotein; MAP, mean arterial pressure; MET, metabolic equivalent; SNP, sodium nitroprusside