Table 2.

Variables in Current Model and Alternative Independently Developed Model Using Same Data Set

Current Model	Alternative Model*
Primary care physician designee in registration field	Days since last visit with physician
Physician practice style	Physician practice style
Patient age	Waiting fraction†
Months since last visit with physician	Visit difference‡
Patient's residence listed as in state	Future difference§
	Idle ratio¶

^*Independently developed model using same development and testing data sets, but designed to use data that would be available in most electronic scheduling systems (Lasko et al.)⁹

^†Total number of days waited for appointments with the given physician, divided by the total days waited for all physicians combined

^‡Total number of visits that a patient has made to the given physician minus the total to all other physicians combined

^§Total number of appointments scheduled for future visits with the given physician, minus the total for all other physicians combined

^¶Number of days since the last visit to the given physician, divided by the number of days since the first visit