Table 1.

Risks of Kidney Failure and Serious Infection at 1 Year With or Without the Plasma Exchange Across the 5 Scenarios

Serum Creatinine (μmol/L)	Kidney Failure at 1 Year			Serious Infection at 1 Year
	Without Plasma Exchange	With Plasma Exchange	Risk Difference	Without Plasma Exchange	With Plasma Exchange	Risk Difference
150	2/100	1/100	−1/100	9/100	11/100	+2/100
250	8/100	5/100	−3/100	18/100	23/100	+5/100
350	15/100	9/100	−6/100	27/100	34/100	+7/100
450	28/100	17/100	−9/100	36/100	46/100	+10/100
600	40/100	25/100	−15/100	50/100	64/100	+14/100

Note: The risk estimates were derived from European Vasculitis Study Group trials and a meta-analysis of plasma exchange in antineutrophil cytoplasmic antibody-associated vasculitis.²⁰