Effects of personality traits on the manifestations of irritable bowel syndrome

Table 2 Difference between non-IBS group and IBS subgroups in the personality scales

Variables	Non-IBS group (n = 414)	IBS group (n = 143)	IBS subgroup			p value^c
			D-IBS	C-IBS	A-IBS
			(n = 24)	(n = 50)	(n = 69)
Sex (male (%))	64	48 ^§	58	32	55	p = 0.0001
Age	19 ± 1	19 ± 1	19 ± 1	19 ± 1	19 ± 1	p = 0.1479
IBS-SI	27.3 ± 39.8	53.9 ± 50.2 ^†	47.9 ± 39.5 ^**	51.6 ± 56.0 ^**	57.6 ± 49.3 ^**	p = 0.0001
K6^a	4.9 ± 4.2	6.7 ± 5.0 ^†	8.3 ± 5.1 ^**	5.5 ± 4.0	7.1 ± 5.4 ^**	p = 0.0001
Persons with psychological distress (%)^b	5	11 ^§	13	6	15	p = 0.0001
EPI	-	-	-	-	-	-
Extroversion	27.6 ± 10.2	25.8 ± 10.4	25.3 ± 10.8	27.1 ± 9.2	25.1 ± 11.2 ^*	p = 0.2228
Neuroticism	21.4 ± 10.8	22.4 ± 10.4	26.0 ± 9.4 ^{* ¶}	20.5 ± 11.5	22.5 ± 9.6	p = 0.1430
Lie score	13.3 ± 5.7	13.4 ± 6.0	12.4 ± 5.8	14.1 ± 6.6	13.3 ± 5.7	p = 0.6855

^aPersons with scores of ≥13 points (out of a total 24 points) on the K6 were defined as experiencing psychological distress.
^bValues are the percentages of the total number of participants (i.e., IBS group plus non-IBS group).
^cOne-way ANOVA was performed using the data from the non-IBS group, and the groups with the diarrhea-type, constipation-type and alternating-type IBS.
^†p < 0.01 vs. non-IBS group; *p < 0.05 and **p < 0.01 vs. non-IBS group, unpaired t-test.
^§p< 0.01 vs. non-IBS group, chi square test.
^¶p < 0.05 vs. C-IBS group, unpaired t-test.

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