. 2016 Jun 10;4:2800311. doi: 10.1109/JTEHM.2016.2579638

TABLE 1. Example data from an in-home phone monitor showing an example of both a spurious event: the additional ‘off hook’ signal at 23:01:12, and a missed event: there should be an ‘on hook’ signal after the off hook at 18:10:20.