Table 2. Features and subtypes of IBS .
| Variable | Non-smokers (n=200) | Smokers (n=200) | P-value b |
| Diagnosed with IBS (%) | 28 (14%) | 10 (5%) | 0.002 |
| Males | 12 (6%) | 5 (2.5%) | |
| Females | 16 (8%) | 5 (2.5%) | |
| Mean age in years (range) | 31.8 (18-60) | 39.9 (23-50) | |
| Sub-types of IBS | 0.806 | ||
| IBS-C | 5 | 1 | |
| IBS-D | 7 | 4 | |
| IBS-M | 12 | 4 | |
| IBS-U | 4 | 1 | |
| Symptoms (%) | 0.872 | ||
| Abdominal pain/discomfort | 28 (100%) | 10 (100%) | |
| Improvement with defecation | 21 (75%) | 10 (100%) | |
| Change in frequency of stool | 21 (75%) | 7 (70%) | |
| Change in consistency of stool | 23 (82%) | 7 (70%) |
IBS: Irritable Bowel Syndrome; IBS-C: constipation-predominant; IBS-D: diarrhea-predominant; IBS-M: mixed; IBS-U: unsubtyped.
bCalculated using chi-square; p-value <0.05 considered statistically significant