直肠内脏敏感性女性肠易激综合征无精神病合并症与健康志愿者相比，

Rectal baseline volume (tone) and volume at the distension of 8 mmHg and 24 mmHg in 38 IBS patients without comorbid psychiatric disorders (subdivided into IBS patients with diarrhoea and alternating stool habits), in 11 IBS patients with phobic anxiety and in 9 healthy volunteers. Values are mean ± SD; pressure is reported in mmHg, volume in Ml; the baseline volume was only registered in 34 IBS patients without psychiatric comorbidity and 9 IBS patients with comorbid phobic anxiety. The volume at 8 mmHg distension was only registered in 10 IBS patients without comorbid phobic anxiety. The volume at 24 mmHg distension was only registered in 34 IBS patients without psychiatric comorbidity, 10 IBS patients with comorbid phobic anxiety, and 8 healthy volunteers.