Table 3.

Mean (SD) values for breathing rate and concurrent validity measured with the Breath Counter app and stethoscope methods.

Stethoscope method, median (95% CI)	App method, median (95% CI)	Intraclass correlation coefficient (95% CI)	P valuea	Pearson r (P value)	R²	Limits of agreement (95% CI)	Coefficient of variation, %	Coefficients of variation of method errors	Repeatability coefficient	Repeatability coefficient, %
15 (15.00 to 15.66)	14.66 (14.25 to 15.07)	0.793 (0.59 to 0.887)	.08	0.722 (<.001)	0.521 (<.001)	−0.5 (−2.80 to 1.70)	2.58	1.83	0.48	1.90

^aA Mann-Whitney U test for independent samples was performed. In all analyses, P<.05 (with a 95% CI) was considered significant.