Table 1.

Eligibility criteria for four models of weaning units

	Unit A	Unit B	Unit C	Unit D
Minimum period of consecutive ventilation	21 days	21 days	21 days	21 days
Minimum period free from RRT prior to transfer	7 days	2 days	RRT allowed	RRT allowed
Minimum period free from vasoactive treatment prior to transfer	7 days	2 days	7 days	2 days

RRT, renal replacement therapy.