Table 4. Immunofluorescence findings by light microscopy pattern.

	Crescentic (n=26), n (%)	Acute proliferative (n=18), n (%)	Mesangial proliferative (n=5), n (%)
Staining pattern
None	2 (8)	0	1 (20)
Mesangial-only	13 (50)	3 (17)	4 (80)
Capillary wall and mesangium	11 (42)	13 (72)	0
Capillary wall-only	0	2 (11)	0
	% Positive (mean intensity)	% Positive (mean intensity)	% Positive (mean intensity)
Immunoreactant
IgG	15 (1.8)	50 (1.9)	0
IgM	58 (2.1)	17 (1.7)	0
IgA	12 (1.7)	61 (2.3)	0
C3	92 (2.5)	100 (2.8)	100 (2.8)
	n (%)	n (%)	n (%)
Pauci-immune	11 (42)	6 (33)	5 (100)

Abbreviations: C3, complement component 3; Ig, immunoglobulin.