Comparison of telomere length between smoked and control mice segregated by age.

<p>Telomere length is greatest in young control animals and is decreased by smoke. Telomere length is also decreased by age but not affected by smoke in old animals. Data are shown as median and interquartile range (box). N = 5 animals/group. * P = 0.0055; † P = 0.0452.