Table 2. The Chi-Square Test Results of the Re-Hospitalization Rate Among Males and Females in Two Groups of Opium-Dependent and Non-Opium-Dependent Patients.

	One-Time Hospitalization a	Two Times of Hospitalization a	Three Times of Hospitalization a	No Re-Hospitalization a	Total	P Value
Opium Dependency						< 0.001
Non-opium-dependent	29 (1.2)	11 (3.4)	4 (9)	278 (86.3)	322
Opium-dependent	18 (33.1)	8 (10.3)	4 (5.1)	48 (61.5)	78

^a Values are presented as No. (%).