Demographic and clinical characteristics of IBS patients and controls
| Sweden | USA | Total | ||||
| Control | IBS | Control | IBS | Control | IBS | |
| N | 900 | 427 | 231 | 434 | 1131 | 861 |
| Mean age, years | 45.6 | 42.2 | 36.7 | 44.5 | 43.8 | 43.4 |
| Men/women | 561/339 | 93/334 | 68/163 | 50/384 | 629/502 | 143/718 |
| Alternating (IBS-A) | 179 | 84 | 263 | |||
| Constipation (IBS-C) | 104 | 157 | 261 | |||
| Diarrhoea (IBS-D) | 144 | 174 | 318 | |||
| Chronic abdominal pain | 19 | 19 | ||||
IBS, irritable bowel syndrome.