Table 3

Univariate analysis in terms of the frequency of exacerbation

Factorr95% CIp Value
Age0.21−0.037 to 0.430.095
BMI−0.010−0.33 to 0.150.435
Smoking history pack-year−0.06−0.30 to 0.190.648
I-SW/SW-I rate0.370.14 to 0.560.002
Deglutition apnoea duration0.270.029 to 0.480.028
Swallowing latency0.290.046 to 0.500.020
FSSG score0.12−0.13 to 0.350.341
CAT0.280.04 to 0.490.025
mMRC Dyspnoea Scale score0.19−0.06 to 0.420.131
FEV1−0.30−0.51 to −0.060.013
%FEV1−0.24−0.45 to 0.0080.057
FVC−0.21−0.43 to 0.0350.093
FEV1/FVC−0.27−0.48 to −0.030.028
VC−0.32−0.53 to −0.090.007
%VC−0.25−0.47 to −0.0010.049
IC/TLC−0.35−0.54 to −0.110.004
RV/TLC0.23−0.01 to 0.450.064
DLco−0.36−0.55 to −0.120.003
  • 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; IC, inspiratory capacity; I-SW, swallowing during inspiration; mMRC, modified Medical Research Council; r, Pearson’s correlation coefficient; RV, residual volume; SW-I, swallowing immediately followed by inspiration; TLC, total lung capacity; VC, vital capacity.