Table 1 Generated variables and their descriptions

Distance

The distance in miles between patient home address and clinic ZIP codes.

Median household income

Annual income was extrapolated from the median household income in each patient’s ZIP code.

Appointment After Long Weekend

Variable indicating if day before the appointment was public holiday.

Cancelation Last Appointment

Variable indicating if the patient’s last appointment was a cancelation.

Waiting Time

The number of days between the date appointment was made and the actual appointment date.

Time Since Prior Appointment

Number of days between current appointment and most recent prior appointment.

Time Since Prior Cancelation

Number of days between current appointment and most recent prior cancelation.

Temperature

Average of hourly temperature on appointment date (Fahrenheit).

Precipitation Intensity

Intensity of precipitation occurring at appointment time (inches of liquid water per hour).

Patient’s appointment history

Features related to patient’s appointment history include total appointments, total cancelations, and total appointments completed.