Table 2. OIRD values of respiratory frequency and peak inspiratory airflow in normoxic conditions and the several types of statistical tests.

The respiratory frequency OIRD in Arrb2+/+ is larger than Arrb2+/- and -/-. The PIF OIRD for Arrb2+/- is smaller than Arrb2+/+ and -/-.

	Arrb2 -/-OIRD mean (95% CI)	Arrb2+/- mean (95% CI)	Arrb2 +/+ mean (95% CI)	Arrb2 -/- vs. Arrb2 +/+ (t-test)	Arrb2 -/- vs. Arrb2 +/+(t-test 95% CI)	One-way anova	Tukey HSD/Kramer Arrb2 -/- vs. +/+	Two-way anova regression(interaction)
Freq.	0.38 (0.35→0.41)	0.38 (0.35→0.41)	0.47 (0.44→0.50)	P = 0.001	0.05→0.14	0.002	0.003	0.22
PIF	0.66 (0.61→0.71)	0.55 (0.48→0.56)	0.68 (0.63→0.71)	P = 0.83	–0.13→0.16	0.03	0.96	0.05