Table 3.

Within-person coefficients of variation of NT-proBNP by subgroups of dialysis modality, ischemic heart disease status, left ventricular hypertrophy, cardiac diastolic function, hydration status, tertiles of C-reactive protein concentration, and quartiles of NT-proBNP concentration

Subgroup	Weekly Within-Person Coefficient of Variation, CVI (%)	P Value
Dialysis modality
Peritoneal dialysis	24.5 (20.5 to 29.2)	0.45
Hemodialysis	29.3 (24.5 to 35.2)
Coronary artery disease
Absent	29.3 (25.3 to 34.0)	0.15
Present	18.8 (14.7 to 24.1)
Left ventricular hypertrophy
Absent	28.6 (24.3 to 33.7)	0.52
Present	24.3 (19,9 to 29.7)
Diastolic dysfunction
Nil/mild	27.3 (22.8 to 32.8)	0.98
Moderate/severe	27.1 (22.7 to 32.5)
Hydration status
Normohydration	28.4 (24.7 to 32.7)	0.28
Moderate/severe overhydration	22.3 (15.9 to 31.3)
C-reactive protein concentration (mg/L)
First tertile (2–4)	29.6 (23.9 to 36.7)	0.43
Second tertile (5–13)	28.8 (23.3 to 35.7)
Third tertile (14–59)	20.6 (16.3 to 26.0)
NT-proBNP concentration (pg/ml)
First quartile (180–718)	29.4 (22.6 to 38.5)	0.89
Second quartile (719–1698)	29.7 (22.6 to 39.0)
Third quartile (1699–3742)	25.1 (19.6 to 32.1)
Fourth quartile (3743–44,091)	23.9 (19.0 to 30.2)

Data are presented as mean (95% confidence interval).