Table 1. Parameters for estimating peak-week ventilator demand in mild, moderate, and severe influenza pandemics, Texas, USA*.

Parameter	Mild (2009-like)	Moderate (1957- and 1968-like)	Severe (1918-like)	Source
Hospitalization scaling over mild	1	3.14	36	(2,21)
Proportion of hospitalized ILI patients requiring ICU care	0.2	0.25	0.25	(2,19,21,22,23)
Proportion of ICU patients requiring ventilation	0.5	0.5	0.5	(2,21,22)
Proportion of ventilated patients requiring 2 weeks of ventilation	0.4	0.4	0.4	(22)
Region-to-region correlation for peak-week demand	0.7	0.7	0.7	Estimated

*ICU, intensive care unit; ILI, influenza-like illness.