Prevalence of IBS |
Crude rate (n = 533) | 7.4 (6.2 to 8.6) | 13.7 (12.5 to 15.0) | 11.1 (10.2 to 12.0) |
Standardised ratea | 6.6 (5.3 to 8.0) | 14.0 (12.4 to 15.7) | 10.5 (9.4 to 11.6) |
Age groups |
<30 years (n = 52) | 3.6 (1.5 to 7.2) | 13.2 (9.8 to 17.3) | 9.7 (7.3 to 12.5) |
30–39 years (n = 133) | 8.2 (5.5 to 11.7) | 17.5 (14.6 to 20.8) | 14.2 (12.1 to 16.6) |
40–49 years (n = 87) | 7.0 (4.6 to 10.1) | 15.3 (12.0 to 19.2) | 11.4 (9.2 to 13.9) |
50–59 years (n = 95) | 8.4 (5.7 to 12.0) | 17.9 (14.1 to 22.1) | 13.4 (11.0 to 16.2) |
60–69 years (n = 79) | 8.6 (6.0 to 12.0) | 11.4 (8.5 to 14.8) | 10.1 (8.1 to 12.4) |
70–79 years (n = 61) | 7.4 (4.7 to 11.0) | 9.0 (6.5 to 12.1) | 8.4 (6.5 to 10.6) |
>80 years (n = 26) | 4.8 (1.6 to 10.9) | 8.4 (5.3 to 12.6) | 7.4 (4.9 to 10.6) |
Deprivation score (Townsend score) |
Very deprived (n = 253) | 9.0 (7.2 to 11.1) | 15.0 (13.0 to 17.1) | 12.5 (11.1 to 14.0) |
Moderately deprived (n = 80) | 5.3 (3.1 to 8.3) | 13.3 (10.4 to 16.7) | 10.1 (8.0 to 12.4) |
Moderately affluent (n = 88) | 7.7 (4.9 to 11.3) | 12.9 (10.1 to 16.1) | 10.9 (8.9 to 13.3) |
Very affluent (n = 107) | 5.9 (4.0 to 8.3) | 12.5 (10.0 to 15.3) | 9.6 (7.9 to 11.4) |
Symptom typeb |
Constipation predominant IBS (n = 111) | 1.2 (0.8 to 1.8) | 3.1 (2.5 to 3.8) | 2.3 (1.9 to 2.8) |
Diarrhoea predominant IBS (n = 117) | 2.2 (1.6 to 3.0) | 2.6 (2.0 to 3.2) | 2.4 (2.0 to 2.9) |
Alternating predominant (n = 215) | 2.7 (2.0 to 3.5) | 5.7 (4.9 to 6.7) | 4.5 (3.9 to 5.1) |
Other (n = 17) | 0.3 (0.1 to 0.7) | 0.4 (0.2 to 0.7) | 0.4 (0.2 to 0.6) |