Fig. 5
From: Interobserver variability of ventilatory anaerobic threshold in asymptomatic volunteers
(a) Bland-Altman plots and (b) Passing-Bablok regression analysis of ventilatory anaerobic threshold (expressed as VO2@AT) determined manually by (i, ii) physician readers or (iii) trained assistants compared with VO2@AT derived from a software-based algorithm. Upper and lower Bland-Altman plots show percentage difference and difference in mL/min, respectively. CI = confidence interval; SD = standard deviation; VO2@AT = oxygen uptake at the anaerobic threshold