Table 2.

Predictor variable definitions.

Predictor variable	Definition
Average interkey delay	The average time between keystrokes measured in seconds
Backspace ratio	Number of backspace keypresses divided by total keypresses
Autocorrect rate	Number of autocorrect events divided by total keypresses
Circadian baseline similarity	The cosine-based similarity between the hourly distribution of keypresses/week and the hourly distribution for the study period
Average accelerometer displacement	Square root of sum of squares of accelerometer displacement along each coordinate (x, y, z) averaged over the week (average of √x2+y2+z2)
Average session length	Length of sessions in seconds averaged over the week
Session count	Number of sessions: A session begins when a keypress is initiated and ≥5 s has elapsed since the last key was pressed. A session ends when ≥5 s has elapsed since the last key was pressed.