Fig 6. Distribution of all UV sensor events at the hour level.

Sensor events corresponding to true positive (TP) and false negative (FN) self-reports (based on the start time of the sensor event) are further divided into 5 groups based on their duration: 15-29 minute events, 30-59 minute events, 1-2 hour events, 2-3 hours events, and events longer than 3 hours.