Table 1.
Characteristics of control and IBS study population.
| Control (n = 65) | IBS (n = 80) | |
|---|---|---|
| Age range, years (mean) | 19–65 (45) | 17–66 (39) |
| Sex (male/female) | 16/49 | 15/65 |
| BMI Class, n (%) | ||
| Normal | 25 (38) | 31 (39) |
| Obese Class I | 11 (17) | 14 (18) |
| Obese Class II | 3 (5) | 5 (6) |
| Obese Class III | 1 (2) | 3 (4) |
| Overweight | 21 (33) | 22 (28) |
| Underweight | 3 (5) | 3 (4) |
| HADS: Anxiety, n (%) | ||
| Normal (0–10) | 59 (91) | 58 (73) |
| Abnormal (11–21) | 6 (9) | 22 (28) |
| HADS: Depression, n (%) | ||
| Normal (0–10) | 64 (98) | 70 (88) |
| Abnormal (11–21) | 1 (2) | 10 (13) |
| Bristol Stool Score, n (%) | ||
| Normal | 54 (83) | 18 (23) |
| Constipated | 8 (12) | 22 (28) |
| Diarrhoea | 3 (5) | 40 (50) |
| IBS subtype, n (%) | ||
| IBS-C | N/A | 30 (38) |
| IBS-D | 21 (36) | |
| IBS-M | 29 (36) | |
| SeHCAT assayed, n (%) | 9 (14) | 46 (58) |
| Dietary group (FFQ), n (%) | ||
| Omnivore | 63 (97) | 74 (93) |
| Vegetarian | 1 (2) | 2 (3) |
| Pescatarian | 1 (2) | 1 (1) |
| Gluten-free | 0 (0) | 4 (5) |
| Drinks alcohol, n (%) | ||
| Current | 54 (83) | 57 (71) |
| Previous | 0 (0) | 1 (1) |
| Never | 10 (15) | 22 (28) |
| Smoker, n (%) | ||
| Current | 10* (15) | 14* (18) |
| Previous | 13 (20) | 18 (23) |
| Never | 42 (65) | 48 (60) |
* 1 subject in each group smoked e-cigarettes.
BMI: Body Mass Index, FFQ: Food Frequency Questionnaire, HADS: Hospital Anxiety and Depression Scale, N/A: not applicable.