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Table 1 Study population characteristics

From: Airways resistance and specific conductance for the diagnosis of obstructive airways diseases

  Healthy Obstruction Other pulmonary diseases
Subjects, n 157 651 168
Age, years 53 (41–64) 55 (42–65) 57 (44–67)
Smoking, pack yr. 0 (0–5) 0 (0–30) 0 (0–15)
BMI, kg/m2 25.3 (21.6–28.7) 25.2 (21.1–29.7) 27.6 (23.1–32.0)
FEV1, %predicted 103.3 (91.5–114.7) 84.2 (67.0–97.7) 88.1 (74.4–103.8)
FVC, %predicted 106.6 (97.2–114.9) 97.7 (84.4–110.4) 92.1 (76.5–107.8)
DLCO, %predicted 86.4 (77.0–99.2) 78.7 (63.0–89.9) 70.3 (56.3–85.7)
RV, %predicted 106.9 (91.6–129.7) 131.6 (104.0–159.9) 101.8 (80.9–124.6)
TLC, %predicted 104.6 (95.7–112.1) 106.0 (94.8–117.1) 88.6 (79.7–103.4)
FRC, %predicted 105.1 (93.4–123.1) 119.4 (99.2–143.3) 95.7 (78.0–116.5)
RAW, kPa/L/s 0.24 (0.18–0.30) 0.32 (0.23–0.45) 0.25 (0.17–0.35)
sGAW, 1/ kPa*sec 1.21 (0.95–1.57) 0.84 (0.56–1.17) 1.28 (0.90–1.71)
  1. Definition of abbreviations: BMI body mass index, D L,CO carbon monoxide diffusing capacity, FEV 1 forced expiratory volume in one second, FRC functional residual capacity, FVC forced vital capacity, RV residual volume, R AW airway resistance, sG AW specific airway conductance, TLC total lung capacity, Values are median and IQR