Table 1 Variable definition

Demand (Dt)

Present day demand data

Dt.1

Demand from one day ago

Dt.2

Demand from two days ago

Dt.3

Demand from three days ago

Dt.7

Demand from seven days ago

Dt.1.2

Interaction between Dt.1 and Dt.2

Mt

Yesterday Medicine Census

Ut

Yesterday Surgical Census

Cen_Mid

Yesterday’s total 12AM census