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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
  1. 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]