Table 6.

Breath‐by‐breath agreement of tidal breathing parameters obtained using SLP and PNT during rest and post exercise measurement sessions (repeatability cohort)

Tidal breathing parameters	Breath‐by‐breath agreement		P‐valuea [lower, upper]
	Mean bias	LOA
RR (brpm)
REST1	0.019	−1.61, 1.65	[0.32, 0.24]
REST2	−0.015	−1.22, 1.19
Combined REST	0.001	−1.42, 1.42	[0.03, 0.04]
POST‐CST	−0.045	−2.72, 2.64
tI (sec)
REST1	0.015	−0.28, 0.31	[0.65, 0.81]
REST2	0.023	−0.24, 0.29
Combined REST	0.019	−0.26, 0.30	[<0.001, <0.001]
POST‐CST	0.011	−0.07, 0.09
tE (sec)
REST1	−0.016	−0.28, 0.25	[0.85, 0.80]
REST2	−0.014	−0.29, 0.26
Combined REST	−0.015	−0.29, 0.26	[<0.001, <0.001]
POST‐CST	−0.008	−0.09, 0.07
tTot (sec)
REST1	−0.001	−0.37, 0.37	[0.99, 0.83]
REST2	0.009	−0.37, 0.39
Combined REST	0.004	−0.37, 0.38	[<0.001, <0.001]
POST‐CST	0.002	−0.06, 0.06
tI/tE
REST1	0.016	−0.17, 0.20	[0.57, 0.61]
REST2	0.017	−0.14, 0.18
Combined REST	0.016	−0.16, 0.20	[0.72, 0.55]
POST‐CST	0.022	−0.18, 0.22
tI/tTot
REST1	0.005	−0.05, 0.06	[0.60, 0.66]
REST2	0.006	−0.04, 0.05
Combined REST	0.005	−0.05, 0.06	[0.94, 0.95]
POST‐CST	0.006	−0.05, 0.06
IE50
REST1	0.003	−0.66, 0.66	[0.75, 0.75]
REST2	0.060	−0.60, 0.72
Combined REST	0.034	−0.63, 0.69	[0.21, 0.19]
POST‐CST	0.031	−0.43, 0.49

brpm, breaths per minute; IE50, inspiratory to expiratory flow ratio at 50% tidal volume (or SLP equivalent); LOA, limits of agreement; PNT, pneumotachography; POST‐CST, post exercise measurement session; REST1, resting breathing measurement session 1; REST2, resting breathing measurement session 2; RR, respiratory rate; SLP, structured light plethysmography; tE, expiratory time; tI, inspiratory time; tI/tE, inspiratory/expiratory time ratio; tI/tTot, duty cycle; tTot, total breath time.

^a P‐values test the equivalence of the lower and upper LOA in REST1 versus REST2 and Combined REST (REST1 and REST2) versus POST‐CST.