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. 2015 Jul 21;10(7):e0133382. doi: 10.1371/journal.pone.0133382

Table 1. Mean relative telomere length by selected characteristics.

Selected Characteristics 1 N % Mean RTL 2 SE 2 P 2 , 3
Total 568 100.0 1.09 0.02 -
Age at blood draw
31–51 147 25.9 1.12 0.05
52–58 136 23.9 1.20 0.05
59–68 154 27.1 1.05 0.04
69–94 131 23.1 0.97 0.05 0.01
Race
White 541 97.8 1.09 0.02
Black 8 1.4 1.09 0.20
Other 4 0.7 0.79 0.28 0.56
State of Residence
North Carolina 283 49.8 1.12 0.03
Iowa 285 50.2 1.06 0.03 0.21
Education
High school or less 274 49.5 1.09 0.03
More than high school 279 50.5 1.08 0.03 0.89
Cigarette smoking
Never 325 57.4 1.06 0.03
Former 184 32.5 1.03 0.13
Current 40 7.1 1.15 0.09
Not regular 17 3.0 1.08 0.09 0.31
Drank alcohol last year
Never 212 37.4 1.13 0.04
Ever 355 62.6 1.12 0.03 0.16
Body Mass Index (kg/m 2 )
<18.5 1 0.2 - -
18.5–24 103 18.2 1.05 0.06
25–29 283 50.0 1.08 0.03
≥30 179 31.6 1.12 0.04 0.12

1Selected characterisitics ascertained at last follow-up, except age at blood draw

2Age at blood draw

3F-test for difference in mean using natural log of TL