Table 4

Multivariate regression analysis in terms of the frequency of exacerbation

Model 1Model 2Model 3
β95% CIp Valueβ95% CIp Valueβ95% CIp Value
I-SW/SW-I rate0.370.69 to 2.62<0.0010.330.48 to 2.490.004
GER symptom (FSSG ≥8)0.230.0001 to 1.120.0490.13−0.22 to 0.880.243
%FEV1−0.07−1.86 to 0.980.535−0.06−1.88 to 1.120.613−0.06−1.79 to 1.040.597
IC/TLC−0.31−1.17 to −0.310.013−0.28−9.37 to −0.410.032−0.30−9.42 to −0.300.016
Cumulative R2 0.270.180.29
  • FEV1, forced expiratory volume in 1 s; FSSG, frequency scale for symptoms of gastro-oesophageal reflux disease; GER, gastro-oesophageal reflux; IC, inspiratory capacity; I-SW, swallowing during inspiration; SW-I, swallowing immediately followed by inspiration; TLC, total lung capacity.