Fig. 3From: Reliability of breath by breath spirometry and relative flow-time indices for pulmonary function testing in horsesRespiratory frequency and tidal volume determination on each day of testing (reproducibility). Results are shown as mean (cross), median (horizontal line), quartiles (box) and 10–90th percentile (whiskers). Results from each day of testing represent the mean of three breaths analysed for each horse. P values were determined by one-way RM-ANOVABack to article page