Figure 2.

Scatterplots for the respiratory event index (REI) at each time interval versus the REI for the total recording time (REI_TRT). The concordance correlation coefficient (CCC) measures the amount of variation from the y = x line and ranges from -1 to 1, where 1 is perfect positive agreement and 0 is no agreement. The scatterplots for the 60-, 180-, 300-, and 420-min intervals demonstrate improving agreement with increasing recording time duration. Strong concordance is denoted by the asterisk.