Table 2 Pulmonary function testing by smoking status in Korean adults
| Â | FEV1, Liter/sec | Predicted FEV1, % | FVC, Liter/sec | Predicted FVC, % | FEV1/FVC, % |
|---|---|---|---|---|---|
Total (N = 12,919) |  |  |  |  |  |
Non-users (n = 6924) | 2.61 (2.58–2.63) | 90.3 (89.6–91.0) | 3.39 (3.36–3.42) | 90.5 (89.9–91.2) | 76.8 (76.4–77.2) |
Former smokers (n = 3282) | 2.58 (2.55–2.61) | 88.7 (87.9–89.6) | 3.44 (3.40–3.47) | 90.5 (89.8–91.2) | 75.3 (74.9–75.8) |
Current smokers (n = 2549) | 2.56 (2.53–2.59) | 87.9 (87.1–88.8) | 3.45 (3.42–3.49) | 91.1 (90.4–91.9) | 74.5 (74.1–75.0) |
Dual users (n = 164) | 2.55 (2.45–2.64) | 86.4 (84.1–88.7) | 3.45 (3.33–3.56) | 90.0 (87.8–92.1) | 74.2 (72.9–75.5) |
Ptrend |  < 0.001 |  < 0.001 | 0.007 | 0.215 |  < 0.001 |
Men (n = 6596) |  |  |  |  |  |
Non-users (n = 1165) | 3.01 (2.96–3.06) | 89.7 (88.4–91.0) | 3.94 (3.89–4.00) | 89.2 (88.2–90.3) | 76.0 (75.3–76.7) |
Former smokers (n = 3039) | 2.98 (2.95–3.02) | 87.8 (86.7–88.9) | 3.99 (3.95–4.04) | 89.1 (88.3–89.9) | 74.4 (73.7–75.0) |
Current smokers (n = 2237) | 2.93 (2.89–2.97) | 86.4 (85.2–87.6) | 3.99 (3.94–4.03) | 89.4 (88.5–90.3) | 73.1 (72.5–73.8)) |
Dual users (n = 155) | 2.90 (2.80–3.01) | 85.1 (82.6–87.6) | 3.97 (3.85–4.09) | 88.2 (86.0–90.5) | 72.8 (71.5–74.2) |
Ptrend |  < 0.001 |  < 0.001 | 0.250 | 0.927 |  < 0.001 |
Women (n = 6323) |  |  |  |  |  |
Non-users (n = 5759) | 2.23 (2.21–2.26) | 91.5 (90.6–92.4) | 2.85 (2.82–2.88) | 92.3 (91.5–93.1) | 78.1 (77.7–78.5) |
Former smokers (n = 243) | 2.25 (2.19–2.31) | 90.5 (88.4–92.6) | 2.91 (2.84–2.98) | 92.7 (90.8–94.6) | 77.1 (76.1–78.0) |
Current smokers (n = 312) | 2.28 (2.23–2.33) | 91.2 (89.6–92.9) | 2.95 (2.88–3.02) | 93.5 (91.9–95.1) | 77.0 (76.3–77.8) |
Dual users (n = 9) | 2.14 (1.78–2.50) | 88.0 (76.6–99.4) | 2.85 (2.48–3.22) | 92.4 (83.3–101.5) | 74.7 (69.4–80.0) |
Ptrend | 0.144 | 0.420 | 0.003 | 0.153 |  < 0.001 |