The years selected for comparison were July 1, 1998, through June 30, 1999, and July 1, 1999, through June 30, 2000. Claims data were extracted for these periods, along with the corresponding authorization and the first date of service for each claim. Clinicians' availability was measured as the number of days between an authorization for service and the first date of that service—the appointment interval. The UBH business standard for the appointment interval is ten days.