Journal of Neurogastroenterology and Motility

Table. 3. Table 3

Prevalence of Irritable Bowel Syndrome Subtypes in Japan, China, and South Korea

	Japan (n = 2060)	China (n = 1030)	South Korea (n = 820)	χ² (df)	P-value
IBS	307^a 14.9 (13.4-16.5)	57^b 5.5 (4.3-7.1)	128^a 15.6 (13.3-18.3)	63.44 (2)	< 0.001
%	307^a 14.9 (13.4-16.5)	57^b 5.5 (4.3-7.1)	128^a 15.6 (13.3-18.3)	63.44 (2)	< 0.001
IBS-D	78^a 3.8 (3.0-4.7)	10^b 1.0 (0.5-1.8)	20 2.4 (1.6-3.7)	20.67 (2)	< 0.001
%	78^a 3.8 (3.0-4.7)	10^b 1.0 (0.5-1.8)	20 2.4 (1.6-3.7)	20.67 (2)	< 0.001
IBS-C	45 2.2 (1.6-2.9)	15 1.5 (0.9-2.4)	21 2.6 (1.7-3.9)	3.02 (2)	0.221
%	45 2.2 (1.6-2.9)	15 1.5 (0.9-2.4)	21 2.6 (1.7-3.9)	3.02 (2)	0.221
IBS-M	160^a 7.8 (6.7-9.0)	27^b 2.6 (1.8-3.8)	48 5.9 (4.44-7.68)	32.23 (2)	< 0.001
%	160^a 7.8 (6.7-9.0)	27^b 2.6 (1.8-3.8)	48 5.9 (4.44-7.68)	32.23 (2)	< 0.001
IBS-U	24^b 1.2 (0.8-1.7)	5^b 0.5 (0.2-1.1)	39^a 4.8 (3.5-6.4)	57.12 (2)	< 0.001
%	24^b 1.2 (0.8-1.7)	5^b 0.5 (0.2-1.1)	39^a 4.8 (3.5-6.4)	57.12 (2)	< 0.001

^aThe observed frequency is significantly higher than the expected frequency at the 1% level.

^bThe observed frequency is significantly lower than the expected frequency at the 1% level.

IBS, irritable bowel syndrome; IBS-D, irritable bowel syndrome with diarrhea; IBS-C, irritable bowel syndrome with constipation; IBS-M, mixed irritable bowel syndrome; IBS-U, unclassified irritable bowel syndrome.

The 95% CI for prevalence is in parentheses.

J Neurogastroenterol Motil 2023;29:229~237 https://doi.org/10.5056/jnm22037