Table 2.

Mean Percent Gamma-radiation-induced G₂/M Arrest by Host Factors

	Cases		Hospital controls			Population controls			Combined controls
	N	Mean (SD)	N	Mean (SD)	Pa	N	Mean (SD)	Pb	N	Mean (SD)	Pc
Overall	299	1.28 (0.84)	228	1.40 (0.82)	0.08	322	1.42 (0.81)	0.03	550	1.41 (0.81)	0.03
Gender
Male	144	1.30 (0.85)	108	1.38 (0.83)	0.48	165	1.27 (0.82)	0.71	273	1.31 (0.82)	0.92
Female	155	1.26 (0.83)	120	1.43 (0.81)	0.07	157	1.57 (0.77)	<0.01	277	1.52 (0.79)	<0.01
Race
AA	81	1.31 (0.84)	64	1.48 (0.71)	0.19	157	1.57 (0.84)	0.02	221	1.54 (0.80)	0.02
CA	218	1.27 (0.84)	164	1.38 (0.85)	0.21	165	1.27 (0.76)	0.97	329	1.32 (0.81)	0.47
Gender/Race
AA/Male	38	1.29 (0.81)	24	1.42 (0.61)	0.53	79	1.44 (0.89)	0.34	103	1.43 (0.83)	0.34
AA/Female	43	1.32 (0.88)	40	1.52 (0.77)	0.26	78	1.71 (0.76)	0.01	118	1.64 (0.77)	0.02
CA/Male	106	1.31 (0.86)	84	1.36 (0.89)	0.64	86	1.11 (0.71)	0.10	170	1.23 (0.81)	0.48
CA/Female	112	1.24 (0.81)	80	1.39 (0.82)	0.19	79	1.44 (0.77)	0.08	159	1.42 (0.80)	0.07
Smoking Status
Never	14	1.09 (0.63)	29	1.27 (0.90)	0.45	128	1.54 (0.71)	0.03	157	1.49 (0.75)	0.06
Former	127	1.32 (0.83)	124	1.40 (0.76)	0.39	154	1.33 (0.86)	0.89	278	1.36 (0.82)	0.59
Current	158	1.27 (0.86)	75	1.47 (0.89)	0.11	40	1.33 (0.86)	0.68	115	1.42 (0.88)	0.16

AA =African American, CA =Caucasian

P_a comparison between cases and hospital controls

P_b comparison between cases and population controls

P_c comparison between cases and combined controls