Table 2.

Case-control comparison of mean mitotic index.

Host factors	Cases		Controls		P-value
	N	Mean (SD)	N	Mean (SD)
All subjects	200	3.59 (1.2)	360	3.26 (1.0)	<0.01
Age
<55	124	3.65 (1.3)	196	3.31 (1.0)	0.05
≥55	76	3.51 (1.0)	164	3.10 (1.0)	0.04
Race
White	147	3.59 (1.2)	224	3.35 (1.0)	0.03
African American	42	3.47 (1.2)	126	3.06 (1.0)	0.02
Active smoking
Ever	71	3.59 (1.0)	148	3.21 (0.9)	0.01
Never	126	3.61 (1.3)	208	3.30 (0.8)	0.02
Menopausal status
Pre-	85	3.53 (1.3)	138	3.28 (1.0)	0.08
Post-	108	3.69 (1.2)	218	3.26 (1.0)	<0.01
BMI categories
<20	14	4.09 (1.8)	19	3.64 (1.0)	0.37
20–25	65	3.75 (1.4)	135	3.52 (1.0)	0.13
26–30	54	3.49 (1.0)	88	3.07 (1.0)	0.01
>30	49	3.29 (1.0)	105	2.99 (0.9)	0.07
Physical activity at age 13–19
Yes	130	3.53 (1.3)	277	3.28 (1.0)	0.03
No	68	3.70 (1.0)	74	3.22 (0.9)	<0.01

Note: *P-values were computed using t-tests.

Abbreviation: BMI, body mass index.