Table 2

Abdominal pain in patients with severe versus non-severe disease

Study	Severe		Non-severe		Total n
Study	Abdominal pain	No pain	Abdominal pain	No pain	Total n
Zhang et al 8	6	51	2	80	139
Wang et al 9	3	33	0	102	138
Pan et al 14	2	35	0	66	103
Total, n	11	119	2	248	380