Economic burden of irritable bowel syndrome in China

Table 1 Characteristics of four irritable bowel syndrome-subtypes n (%)

Characteristics	IBS (n = 105)	IBS-C (n = 23)	IBS-D (n = 42)	IBS-M (n =9)	IBS-U (n = 31)	P value
Age (yr) (mean ± SD)	57.1 ± 10.3	60.3 ± 8.7	54.9 ± 11.9	52.0 ± 9.6	59.3 ± 8.2	0.0491
≤ 50	24 (22.9)	2 (8.7)	12 (28.6)	5 (55.6)	5 (16.1)
51-60	39 (37.1)	11 (47.8)	14 (33.3)	1 (11.1)	13 (41.9)
61-70	35 (33.3)	8 (34.8)	13 (31.0)	3 (33.3)	11 (35.5)
≥ 71	7 (6.7)	2 (8.7)	3 (7.1)	0 (0.0)	2 (6.5)
Disease duration (yr) (mean ± SD)	4.3 ± 5.4	3.0 ± 2.7	5.0 ± 5.7	6.8 ± 10.6	3.8 ± 4.3	0.247
< 1	33 (31.4)	8 (34.8)	11 (26.2)	3 (33.3)	11 (35.5)
1-3	33 (31.4)	9 (39.2)	13 (31.0)	4 (44.4)	9 (29.0)
3-5	19 (18.2)	3 (13.0)	8 (19.0)	0 (0.0)	6 (19.4)
> 5	20 (19.0)	3 (13.0)	10 (23.8)	2 (22.3)	5 (16.1)
Gender						< 0.0012
Male	37 (35.2)	6 (26.1)	24 (57.1)	4 (44.4)	3 (9.7)
Female	68 (64.8)	17 (73.9)	18 (42.8)	5 (55.6)	28 (90.3)
Employment Status						0.094
Retired	42 (40.0)	10 (43.5)	16 (38.1)	3 (33.3)	13 (41.9)
Employed	63 (60.0)	13 (56.5)	26 (61.9)	6 (66.7)	8 (58.1)
Income level						0.096
Lower income	43 (40.9)	10 (43.5)	15 (35.7)	5 (55.6)	13 (41.9)
Middle income	55 (52.4)	12 (52.2)	25 (59.5)	2 (22.2)	16 (51.6)
Higher income	7 (6.7)	1 (4.3)	2 (4.8)	2 (22.2)	2 (6.5)

¹There was significant difference between age distribution of irritable bowel syndrome-constipation (IBS-C) vs IBS-diarrhea (IBS-D) vs IBS-mixed (IBS-M) vs IBS-unclassified (IBS-U) (P = 0.049);

²There was significant difference between gender distribution of IBS-C vs IBS-D vs IBS-M vs IBS-U (P < 0.001). Lower income: < 5000 yuan/mo; Middle income: 5000-10000 yuan/mo; Higher income: > 10000 yuan/mo.