RAGE gene three polymorphisms with Crohn's disease susceptibility in Chinese Han population

Table 1 Characteristics of Crohn's disease patients and healthy controls in a Chinese Han population

Characteristics	CD patients	Control subjects
Number	312	479
Male/female	205/107	308/171
Age, mean ± SD (yr)	34.0 ± 13.0	36.5 ± 15.1
Age at diagnosis (ys)
< 17	42	63
17-40	212	324
> 40	58	92
CD behavior
Inflammatory	179
Stricturing	90
Penetrating	43
CD location
Ileum	194
Colon	27
Ileocolon	91
Perianal lesions
Yes	92
No	220
Appendectomy
Yes	18
No	294
Abdominal operation
Yes	72
No	240

CD: Crohn's disease.