Fig. 2
From: Clinical validation of smartphone-based activity tracking in peripheral artery disease patients
iPhone accuracy analysis. Device accuracy was assessed using scatter plots and Bland-Altman plots. a Scatter plot of iPhone versus manual step counting. b Bland-Altman plot of iPhone versus manual step counting. c Scatter plot of iPhone distance versus measured distance. d Bland-Altman plot of iPhone distance versus observed distance. e Scatter plot of iPhone average stride length versus average measured stride length. f Bland-Altman plot of iPhone average stride length versus average measured stride length. In scatter plots, black dots indicate participants, solid red lines demarcate y = x line, and black dashed lines represent regression lines. The regression equation and coefficient of determination are depicted in the graph’s top left corner. In Bland-Altman plots, solid red lines demarcate the bias and dashed black lines indicate the 95% limits of agreement. Black data points = no walking aid. Yellow data points = walkers. Blue data points = canes
