Characteristics of patients undergoing HRM
| All patients | Positive HRM | Negative HRM | P value | |
| Age (mean) | 56.0±17.9 | 62.9±11.9 | 55.7±17.5 | ns |
| BMI | 30.8±7.9 | 31.9±4.2 | 30.7±8.1 | ns |
| Gender (M:F) | 70:111 | 4:5 | 66:106 | ns |
BMI, body mass index; HRM, high-resolution manometry; ns, no significance.