Table 3. Comparisons of the Lémann score according to the duration of symptoms.

* Standard deviation ** Fisher's exact test for qualitative variables, Wilcoxon test for quantitative variables

	Total N=83			(0-2): No substantial bowel damage (n=50)			[>2]: Substantial bowel damage (n=33)
Duration of symptoms	n	Mean	SD*	n	Mean	SD*	n	Mean	SD*	P**
Total	67	21.6	24.5	43	20.6	24.9	24	23.3	24.2	0.293
<18 months	41	61.2		27	62.8		14	58.3		0.796
> 18 months	26	38.8		16	37.2		10	41.7