Table 1. Histologic score to quantify the degree of ileal inflammation.

Score	Acute inflammation
0	0–1 PMN/hpf within mucosa
1	2–10 PMN/hpf within mucosa
2	11–20 PMN/hpf within mucosa
3	21–30 PMN/hpf within mucosa or 11–20 PMN/hpf with extension below muscularis mucosae
4	>30 PMN/hpf within mucosa or >20 PMN/hpf with extension below muscularis mucosae
Score	Chronic inflammation
0	0–10 ML/hpf within mucosa
1	11–20 ML /hpf within mucosa
2	21–30 ML /hpf within mucosa or 11–20 with extension below muscularis mucosae/follicular hyperplasia
3	31–40 ML /hpf within mucosa or 21–30 with extension below muscularis mucosae/follicular hyperplasia
4	>40 ML /hpf within mucosa or >30 with extension below muscularis mucosae/follicular hyperplasia

PMN: polymorphonuclear cells. ML: mononuclear leukocytes. Hpf: high power field. Scoring scheme adapted from Kontoyiannis et al, 2002.