I need assistance in calculating the accepatable differentials. I have attached the spreadsheet for your review. Please provide me with the formula used, explanation, and sources.

Activity (Door to Activity) Registration (Door to Registration) Co-payment (Door to Registration) Wait for nurse (Door to Triage) Vital signs (Door to Triage) Wait for exam room (Door to Patient Room) Wait for physician (Door to Patient Room) Examination (Door to Provider) Test order entry (Door to Provider) Referral requests (Door to Diagnostic Evaluation by Qualifored Medical Professional) Follow-up appt. sched. (Door to ED Departure for Discharged) Observed Time (OT) 45 55 100 110 130 150 155 158 215 230 National Average (NA) 10 10 25 25 30 30 96 96 20 134 Differential OT vs NA 35 45 75 85 100 120 59 62 195 96 Acceptable Differential