Table 2.

Baseline characteristics of subjects in the subgroups of IBS

	IBS-C		IBS-D		IBS-M
	Placebo group	Active group	Placebo group	Active group	Placebo group	Active group
Subjects (N)	98	82	38	41	51	69
Female (N (%))	87 (88.8%)	75 (91.5%)	30 (79.0%)	31 (75.6%)	39 (76.5%)	55 (79.7%)
Age (mean (SD))	45.4 (14.1)	43.1 (15.5)	46.8 (14.7)	47.8 (16.2)	44.2 (13.8)	46.6 (15.5)
Smoker (N (%))	22 (22.5%)	20 (24.4%)	8 (21.1%)	9 (22.0%)	16 (31.4%)	15 (21.7%)
Pain/discomfort score	3.1 (1.1)	3.2 (1.2)	3.2 (1.0)	3.4 (1.1)	3.1 (1.0)	2.8 (1.0)

IBS-C: constipation predominant IBS; IBS-D: diarrhea predominant IBS; IBS-M: mixed IBS.