Table 1. Characteristics of study participants.

	Peritoneal dialysis patients (N = 18)	Healthy volunteers (N = 43)	Kidney transplant patients (N = 13)
Age (yr, mean ± SEM)	48.56 ± 2.66	41.72 ± 1.70	51.20 ± 3.07
Sex (male, N)	6	20	8
Blood group O (N)	8	31	8
Blood group B (N)	10	12	5
Anti-A IgM titer (median, range)	1:8 (1:4–1:256)	1:16 (1:2–1:128)	1:8 (1:1–1:64)
Anti-A IgM titer in blood group O (median, range)	1:32 (1:4–1:256)	1:32 (1:4–1:128)	1:16 (1:1–1:64)
Anti-A IgM titer in blood group B (median, range)	1:8 (1:4–1:32)	1:8* (1:2–1:64)	1:4 (1:1–1: 16)
Anti-A IgG titer (median, range)	1:16 (1:4–1:256)	1:64 (1:2–1:512)	1:32 (1:1–1:128)
Anti-A IgG titer in blood group O (median, range)	1:64 (1:8–1:512)	1:128 (1:8–1:512)	1:8 (1:1–1:64)
Anti-A IgG titer in blood group B (median, range)	1:8* (1:4–1:32)	1:8† (1:2–1:128)	1:16 (1:1–1:128)

^*P<0.05 in comparison between blood group O and blood group B; ^†P<0.01 in comparison between blood group O and blood group B.

Abbreviation: SEM, standard error of the mean.