Table 1. The Chi-Square Test Results of the Mortality Rate Among Males and Females in Two Groups of Opium-Dependent and Non-Opium-Dependent Patients.

Opium Dependency	Dead a	Alive a	Total	P Value
Non-opium-dependent				0.174
Male	13 (5)	246 (95)	259
Female	6 (9.5)	57 (90.5)	63
Opium-dependent				0.030
Male	6 (8.7)	63 (91.3)	69
Female	3 (33.3)	6 (66.7)	9

^a Values are presented as No (%).