From: Evidence for harm reduction in COPD smokers who switch to electronic cigarettes
Parameter | Baseline | 12-Month Follow-up | 24-Month Follow-up |
---|---|---|---|
COPD EC users reducing cig use (dual users) | (n = 11) | (n = 11) | (n = 11) |
Sex | 10 M, 1 F | 10 M, 1 F | 11 M |
% Smoking reduction compared to baseline | - | 82.6 (±4.8) | 85.1 (±4.7) |
post-BD FEV1a (L) | 1.23 (0.94, 1.6) | 1.20 (0.91, 1.70) | 1.28 (0.92, 1.96) |
post-BD FVCa (L) | 2.34 (2.04, 2.86) | 2.35 (2.07, 2.89) | 2.57 (2.22, 2.93) |
%FEV/FVCa | 50.9 (47, 61.2) | 51.2 (46.9, 64) | 51.8 (43.3, 65.7) |
Cig/dayb | 23.7 (±5.4) | 4 (±1.2) | 3.5 (±1.3) |
CAT scorea | 25 (19.5, 26.5) | 20 (18, 22) | 18 (15, 22) |
COPD Exacerbationsb | 2.6 (±0.8) | 2.3 (±0.8) | 1.5 (±0.8) |
COPD EC users ceasing cig use (single users) | (n = 13) | (n = 13) | (n = 13) |
Sex | 10 M, 3 F | 10 M, 3 F | 9 M, 3 F |
Smoking reduction compared to baseline | - | - | - |
post-BD FEV1a (L) | 1.32 (0.96, 1.76) | 1.26 (0.94, 1.72) | 1.3 (0.95, 1.63) |
post-BD FVCa (L) | 2.57 (2.01, 2.65) | 2.57 (1.92, 2.72) | 2.44 (1.72, 2.82) |
%FEV/FVCa | 61.9 (50.8, 66.4) | 61.5 (50.6, 65.6) | 61.5 (50, 65.2) |
Cig/dayb | 20.2 (±2.7) | - | - |
CAT scorea | 20 (17, 24) | 16 (14, 18) | 17 (15, 20) |
COPD Exacerbationsb | 2.07 (±1.0) | 1.3 (±1) | 1.4 (±1) |