Table 1.

Mean RTL by selected characteristics of the cancer-free study population (n = 1,234).^a

Characteristic	Group	n	RTL (mean ± SD)b	p-Value
Age at buccal cell collection (years)c	41–62	312	1.25 ± 0.34
	63–67	295	1.21 ± 0.39
	68–72	333	1.18 ± 0.33
	73–92	294	1.18 ± 0.38	0.003
BMI	18.65–25.66	392	1.20 ± 0.34
	25.67–28.60	394	1.21 ± 0.38
	28.61–46.98	385	1.21 ± 0.36	0.93
Applicator type	Private	1,184	1.21 ± 0.36
	Commercial	50	1.08 ± 0.43	0.01
State of residence	Iowa	831	1.19 ± 0.32
	North Carolina	403	1.24 ± 0.43	0.03
Education	≤ High school	805	1.20 ± 0.37
	> High school	406	1.21 ± 0.36	0.71
Smoking status	Never	563	1.19 ± 0.32
	Former	562	1.20 ± 0.38
	Current	97	1.25 ± 0.42	0.63
Pack-years of smoking	No	563	1.19 ± 0.32
	< 20	372	1.20 ± 0.32
	≥ 20	258	1.21 ± 0.47	0.90
Chewing tobacco use	No	1,087	1.19 ± 0.36
	Yes	147	1.27 ± 0.34	0.01
Alcohol drinking	No	516	1.22 ± 0.39
	Yes	663	1.19 ± 0.31	0.10
	Low (< 3 drinks/week)	346	1.17 ± 0.34
	High (≥ 3 drinks/week)	317	1.20 ± 0.34	0.25
Cardiovascular disease	No	907	1.21 ± 0.36	0.88
	Yes	326	1.21 ± 0.38
Diagnosis of diabete	No	1,167	1.20 ± 0.36
	Yes	66	1.20 ± 0.33	0.78
High blood pressure	No	607	1.17 ± 0.32
	Yes	225	1.19 ± 0.33	0.22
Family history of any cancers	No	548	1.20 ± 0.33
	Yes	613	1.24 ± 0.39	0.88
Use of any pesti­cides	Low (≤ 236 days)	582	1.21 ± 0.35
	High (> 236 days)	606	1.20 ± 0.37	0.48
ap-Values from linear regression on ln-transformed RTL (continuous) adjusted for age at buccal cell sample collection (continuous) for all characteristics other than age. bArithmetic mean for the stratum-specific estimate of RTL ± SD. cMedian age at buccal cell collection, 68 years.