Table 1

Patients’ characteristics

VariableMean±SD (range)
Total number of patients65
Age, years71.9±8.4 (46–89)
Sex, male/female65/0
Height, cm164.6±6.3 (145.3–178)
Weight, kg60.5±9.4 (41.5–88)
BMI, kg/m2 22.3±3.0 (16–31.6)
Smoking status, former/current60/5
Smoking history, pack-years63.2±32.4 (18–184)
FSSG score6.1±6.04 (0–36)
GER symptoms (FSSG ≥8)20/45
CAT11.28±6.97 (1–28)
mMRC Dyspnoea Scale, 0/1/2/3/421/28/13/2
GOLD stage, I/II/III/IV10/34/14/7
FEV1, L1.63±0.6 (0.62–2.91)
FEV1, % predicted58.87±19.74 (17.7–96.9)
FVC, L3.2±0.8 (1.76–4.99)
FEV1/FVC, %49.94±13.5 (0.23–100)
VC, L3.5±0.7 (2.01–4.95)
VC, % predicted99.61±16 (63–131.7)
IC/TLC, %37.84±6.63 (24.24–52.91)
RV/TLC, %40.9±7.5 (27–67)
DLco, mL/min/mm Hg13.32±5.41 (3.6–28.27)
  • The continuous variables are presented as the mean±SD (range).

  • BMI, body mass index; CAT, Chronic Obstructive Pulmonary Disease Assessment Test; DLco, diffusing capacity of carbon monoxide; FEV1, forced expiratory volume in 1 s; FSSG, frequency scale for symptoms of gastro-oesophageal reflux disease; FVC, forced vital capacity; GER, gastro-oesophageal reflux; GOLD, Global Initiative for Chronic Obstructive Lung Disease; IC, inspiratory capacity; mMRC, modified Medical Research Council; RV, residual volume; TLC, total lung capacity; VC, vital capacity.