Fig. 5
Bland Altman graphs showing the interobserver variability for all 3 methods—Fractal analysis (A), Petersen (B) and Jacquier (C). Interobserver variability was better using the fractal method (ICC 0.97, 95% CI 0.95, 0.99), and considerably more using the Petersen (ICC 0.92, 95% CI 0.83, 0.96) and Jacquier methods (ICC 0.74, 95% CI 0.45, 0.88)