Table 1. Univariate analysis of risk factors for acute myeloid leukemia by using conditional logistic regression.

Variables	Cases	Controls	Odds Ratio (95% CI)	P -value
Cigarette smoking
No	107	115	1.00
Yes	30	22	1.50 (0.79, 2.82)	0.209
Prior chemotherapy
No	111	121	1.00
Yes	26	16	1.76 (0.89, 3.49)	0.101
Prior radiation therapy
No	104	113	1.00
Yes	33	24	1.36 (0.78, 2.36)	0.269
Congenital disorders
No	109	123	1.00
Yes	18	14	1.60 (0.72, 3.52)	0.244
Exposure to chemical agents
No	104	112	1.00
Yes	33	25	1.58 (0.86, 2.91)	0.135
Prior usage of cytotoxic agents
No	127	135	1.00
Yes	10	2	8.00 (1.01, 63.96)	0.050
History of infectious mononucleosis
No	122	125	1.00
Yes	15	12	1.27 (0.57, 2.80)	0.549
Exercise at least twice a week
No	93	97	1.00
Yes	44	40	1.06 (0.64, 1.75)	0.801
Family history of malignancy or solid tumors
No	105	127	1.00
Yes	32	10	3.62 (1.65, 7.92)	0.001
Exposure to electrical power
No	106	127	1.00
Yes	31	10	3.22 (1.52, 6.80)	0.002
History of Blood transfusion
No	104	110	1.00
Yes	33	27	1.21 (0.65, 2.22)	0.538
History of mental diseases
No	74	121	1.00
Yes	63	16	8.50 (3.64, 19.80)	0.001

CI: confidence interval