Table 5.
Prospective cohort study (Polosa 2017) on the effect of e-cigarette use on lung function over time. Results are presented as mean ± standard deviation.
| Baseline | 12 ± 1 months | 24 ± 2 months | 48 ± 2 months | |
|---|---|---|---|---|
| FEV1 (L) | ||||
| NonSmokers (n = 12) | 4.08 ± 0.30 | 4.06 ± 0.2 | 4.03 ± 0.26 | 3.78 ± 0.71 |
| Vapers (n = 9) | 3.82 ± 0.78 | 3.81 ± 0.78 | 4.11 ± 0.30 | 3.87 ± 0.76 |
| FVC (L) | ||||
| NonSmokers (n = 12) | 5.03 ± 0.48 | 4.97 ± 0.42 | 5.01 ± 0.45 | 5.02 ± 0.42 |
| Vapers (n = 9) | 4.93 ± 0.95 | 4.80 ± 0.82 | 4.82 ± 0.91 | 4.87 ± 0.83 |
| FEV1/FVC (%) | ||||
| NonSmokers (n = 12) | 81.45 ± 5.03 | 82.02 ± 4.67 | 80.86 ± 6.18 | 82.06 ± 4.25 |
| Vapers (n = 9) | 78.49 ± 3.46 | 79.01 ± 3.63 | 78.46 ± 2.34 | 79.08 ± 2.83 |
| FEF25-75 (L) | ||||
| NonSmokers (n = 12) | 3.43 ± 0.64 | 3.49 ± 0.61 | 3.53 ± 0.57 | 3.56 ± 0.58 |
| Vapers (n = 9) | 3.29 ± 0.70 | 3.29 ± 0.60 | 3.30 ± 0.75 | 3.33 ± 0.64 |
FEF25-7 maximum mid-expiratory flow, FEV1 forced expiratory volume in 1 s, FVC forced vital capacity, L liters.