Table 2.

Association of TMA and PTC C4d

	TMA+		TMA−		OR	P
	n	%	n	%
For all biopsies
C4d+	6	3.3	176	96.7	0.95	0.92
C4d−	31	3.5	860	96.5	95% CI (0.4 to 2.3)
By time of biopsy
early (≤90 days)
C4d+	5	11.9	38	88.1	3.84	0.03
C4d−	9	3.4	255	96.6	95% CI (1.2 to 12.1)
late
C4d+	1	0.72	138	99.28	0.2	0.09
C4d−	22	3.5	605	96.5	95% CI (0.03 to 1.5)