Red cell distribution width as a biomarker of disease activity in ulcerative colitis and Crohn’s disease

Table 3 Red cell distribution width and laboratory parameters across Crohn’s disease activity groups, median (interquartile range)

Variable	Remission (n = 24)	Mild (n = 35)	Moderate (n = 24)	Severe (n = 7)	P value
RDW-CV (%)	13.8 (12.9-14.8)	13.6 (13.0-14.8)	14.3 (13.5-16.7)	15.2 (14.1-16.2)	0.02
RDW-SD (fL)	43.0 (40.2-45.4)	42.6 (40.4-46.0)	43.9 (41.1-48.6)	45.3 (41.0-48.9)	0.56
CRP (mg/L)	2.0 (0.9-7.7)	4.7 (1.7-13.0)	11.8 (4.6-32.7)	18.4 (7.2-41.5)	< 0.001
Platelets	265 (224-322)	298 (251-348)	321 (263-389)	369 (298-414)	< 0.001

Disease activity was categorized according to the Crohn’s disease activity index. RDW-CV: Red cell distribution width-coefficient of variation; RDW-SD: Red cell distribution width-standard deviation; CRP: C-reactive protein.