Assessment of perianal fistulizing Crohn’s disease activity with endoanal ultrasound: A retrospective cohort study

Table 2 Serum C-reactive protein and fecal calprotectin among three groups

Variables	Group 1 (n = 23)	Group 2 (n = 19)	Group 3 (n = 25)	Value	P value
CRP [M (P25, P75), mg/L]	5.17 (2.20, 14.6)	4.84 (3.28, 23.29)	13.5 (4.02,27.75)	H = 3.832	0.147
CRP (new) [M (P25, P75), mg/L]1	5.9 (2.3, 13.9)	6.03 (3.3, 17.935)	13.5 (4.02,27.75)	H = 3.532	0.171
Fecal calprotectin2 [n (%), ug/g]
< 60	3 (13.6) (1)	2 (11.8) (1)	16 (64.0) (2)	χ2 = 24.060	< 0.001a
60-500	13 (59.1) (1)	13 (76.5) (1)	3 (12.0) (2)
> 500	6 (27.3) (1)	2 (11.8) (1)	6 (24.0) (2)

^aP < 0.05, a statistically significant difference within different categories of a group.

¹C-reactive protein (new) was chosen because an interpolation method was utilized to process missing data for a missing C-reactive protein value in group 1 and 2.

²Group 1 and Group 2 are each missing one value and two values, respectively.

For pairwise comparison within a group, different superscript letters (1,2) represent statistical differences between different categories, that is, P (1, 2) < 0.05, P (1, 1) > 0.05. CRP: C-reactive protein.