Table 4.

Multivariate regression analysis in terms of the frequency of exacerbation

	Model 1			Model 2			Model 3
	β	95% CI	p Value	β	95% CI	p Value	β	95% CI	p Value
I-SW/SW-I rate	0.37	0.69 to 2.62	<0.001	—	—	—	0.33	0.48 to 2.49	0.004
GER symptom (FSSG ≥8)	—	—	—	0.23	0.0001 to 1.12	0.049	0.13	−0.22 to 0.88	0.243
%FEV1	−0.07	−1.86 to 0.98	0.535	−0.06	−1.88 to 1.12	0.613	−0.06	−1.79 to 1.04	0.597
IC/TLC	−0.31	−1.17 to −0.31	0.013	−0.28	−9.37 to −0.41	0.032	−0.30	−9.42 to −0.30	0.016
Cumulative R2	0.27			0.18			0.29

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.