Table 1.

Comparison of the demographic and main clinical results of IBS-D patients and healthy subjects

	IBS-D patients (n = 109)	Healthy subjects (n = 50)	Statistics
Age (years)	36.0 ± 12.2	34.8 ± 13.3	ns (t = 0.565, P = 0.573)
Male/female	57/52	26/24	ns (χ 2 = 0.001, P = 0.973)
BMI	21.40 ± 2.83	21.27 ± 2.32	ns (t = 0.286, P = 0.775)
LM (%)	85 (82/96)	72 (34/47)	χ 2 = 3.522, P = 0.061
LI (%)	45 (43/96)	17 (8/47)	χ 2 = 9.684, P = 0.002
Hydrogen non-producers (%)	12 (13/109)	6 (3/50)	ns (χ 2 = 1.330, P = 0.249)
Maximum H2 excretion (ppm)	61 ± 55	66 ± 58	ns (t = 0.474, P = 0.636)
Total H2 excretion (ppm)	390 ± 328	448 ± 375	ns (t = 0.965, P = 0.336)

IBS-D diarrhea-predominant irritable bowel syndrome, BMI body mass index, LM lactose malabsorption, LI lactose intolerance, ns not significant