Table 5. The duration of respiratory disease and reflux variants, number of refluxes (n = 42)

Reflux variants	Duration of RD <1.5 years n = 21	Duration of RD >1.5 years n = 21	p-value
	Median (IQR)	Median (IQR)
pH-MII parameters by pH channel
DeMeester score	21.16 (6.615 - 42.95)	8.77 (3.08 - 37.99)	0.285
Reflux Index	5.8 (1.7 - 12.9)	1.9 (0.475 - 10.55)	0.247
Acid reflux	67.8 (34 - 175)	44.9 (12.7 - 87.7)	0.056
pH-MII parameters by impedance channel
General reflux1	161.5 (41.3 - 233.45)	136.3 (67.65 - 211.6)	0.950
Acid reflux1	54.5 (14.25 - 93.1)	17.3 (11.3 - 55.05)	0.064
Weakly acid reflux1	61.3 (16.6 - 115.6)	63.2 (38.6 - 146.3)	0.489
Alkaline reflux1	1.4 (0 - 11.65)	2.1 (0 - 16.7)	0.712

Number of episodes in 24 hours,
p <0.05 was calculated using the nonparametric Mann-Whitney U-test; IQR - interquartile range