Table 1 Demographics of study subjects (Preliminary study)
Participants (n = 30,000), n (%) | |
|---|---|
Gender and age range (years) | |
 20-29 in females | 3000 (10) |
 20-29 in males | 3000 (10) |
 30-39 in females | 3000 (10) |
 30-39 in males | 3000 (10) |
 40-49 in females | 3000 (10) |
 40-49 in males | 3000 (10) |
 50-59 in females | 3000 (10) |
 50-59 in males | 3000 (10) |
 60-79 in females | 3000 (10) |
 60-79 in males | 3000 (10) |
Marital status | |
 Married | 17,391 (58) |
 Not married | 12,609 (42) |
Annual household income (yen) | |
  < 2 million | 2557 (8.5) |
 2-4 million | 6818 (22.7) |
 4-6 million | 6564 (21.9) |
 6-8 million | 3940 (13.1) |
 8-10 million | 2321 (7.7) |
 10-12 million | 1089 (3.6) |
 12-15 million | 691 (2.3) |
 15-20 million | 300 (1.0) |
 ≧20 million | 146 (0.5) |
 unknown | 2795 (9.3) |
 not answered | 2779 (9.3) |
Diagnosis of IBS | |
 non-IBS | 25,058 (83.5) |
 IBS (overall) | 4942 (16.5) |
  IBS with constipation (IBS-C) | 835 (2.8) |
  IBS with diarrhea (IBS-D) | 1359 (4.5) |
  Mixed IBS (IBS-M) | 2452 (8.2) |
  Unspecified IBS (IBS-U) | 296 (1.0) |