BMC Primary Care

Table 6 Illness perception: Participants fulfilling Rome IV criteria vs. not fulfilling

From: Illness perception and health care use in individuals with irritable bowel syndrome: results from an online survey

Subscale/Dimension	Rome IV positive		Rome IV negative
	n	Median	n	Median	U	Z	p	r
Time course	317	22.00	177	21.00	23,163.50	-3.234	0.001	0.15
Consequences	315	19.00	176	18.00	22,804.50	-3.272	0.001	0.15
Personal control	319	11.00	185	12.00	24,742.50	-3.035	0.002	0.14
Cure control	316	9.00	181	11.00	22,457.50	-4.003	< 0.001	0.18
Coherence	315	12.00	179	13.00	25,697.50	-1.640	0.101	0.07
Cyclic occurrence	316	15.00	184	14.00	24,751.00	-2.802	0.005	0.13
Emotional representation	318	20.00	180	17.50	21,954.50	-4.333	< 0.001	0.19

In the illness perception questionnaire revised, the term “irritable bowel syndrome” was used instead of “illness” in the original questionnaire. r ≥ 0.1 and < 0.3 ⇒ small effect size, r ≥ 0.3 and < 0.5 ⇒ moderate effect size, r ≥ 0.5 ⇒ large effect size [32, 33]

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