This study | Clinic based | United Kingdom | 0.28 | 0.31 | 0.38 | 0.46 |
Ko et al, 20046 | Clinic based | Taiwan | 0.37 | | 0.47 | 0.63 |
Siganos et al, 200436 | Clinic based | Greece | 0.26 | | | 0.39 |
Bhan et al, 20025 | Clinic based | United Kingdom | 0.23 | 0.10 | 0.28 | |
Gunvant et al, 200421 | Clinic based | United Kingdom | 0.27 | | 0.48 | |
Morgan et al, 200312 | Clinic based | United Kingdom | | | 0.30 | |
Shimmyo et al, 200322 | Clinic based | United States | 0.16 | | | |
Eysteinsson et al, 200223 | Population based | Iceland | | | | 0.22 (M) |
| | | | | | 0.28 (F) |
Dohadwala et al, 19984 | Population based | Indian subcontinent | | 0.29 (M) | | |
| | | | 0.12 (F) | | |
Foster et al, 200324 | Population based | Singapore | 0.15 (R) | | | |
| | | 0.18 (L) | | | |
Foster et al, 199825 | Population based | Mongolia | 0.18 (R) | | | |
| | | 0.24 (L) | | | |
Wolfs et al, 199738 | Population based | Netherlands | 0.19 | | | |
Nemesure et al, 200339 | Population based | Barbados | none | | | |
Feltgen et al, 200116 | Manometry | Germany | none | | | |
Foster et al, 200017 | Manometry | Singapore | none | | | |
Ehlers, 19751 | Manometry | Denmark | 0.71 | | | |