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Table 1 Demographic data and reference values

From: Effects of personality traits on the manifestations of irritable bowel syndrome

Variables All subjects (n = 557) (95% CI) Reference value (general population (95% CI))
Sex (male (%)) 59 (55–63) 47 (36–45) Sugaya and Nomura[16]
Age 19 ± 1 (19–19) - -
IBS+ (%)a 26 (22–30) 14 (12–15) Kubo M, et al. [27]
D-IBS (%)b 4 (3–6) 4 (−) Kubo M, et al. [27]
C-IBS (%)c 9 (7–12) 3 (−) Kubo M, et al. [27]
A-IBS (%)d 12 (10–15) 3 (−) Kubo M, et al. [27]
IBS-SI 34.1 ± 44.2 (30.4-37.8) 30 (−)g Tana C, et al. [28]
K6e,f 5.4 ± 4.5 (5.0-5.7) 3.6 ± 3.9 (−) Sakurai K, et al. [29]
 Persons with psychological distress (%)g 7 (5–9) 7 (7–7) Kuriyama S, et al. [30]
MPI - - -
 Extroversion 27.2 ± 10.3 (26.3-28.0) 27. 2 ± 7.0 (−) Iwawaki, S et al. [31]
 Neuroticism 21.6 ± 10.7 (20.7-22.5) 21.6 ± 7.9 (−) Iwawaki, S et al. [31]
 Lie score 13.4 ± 5.8 (12.9-13.8) 13.4 ± 5.1 (−) Iwawaki, S et al. [31]
  1. Data are expressed as mean ± standard deviation. CI, confidence interval.
  2. a-e,g The numerical values represent the percentage of the total number of participants, namely, IBS patients plus healthy persons.
  3. fPersons with a score of ≥13 points (out of a total 24 points) on the K6 were defined as experiencing psychological distress.
  4. The data (score) represent median values.