Table 1.

Abundance of rDNA CN in leukocyte DNA from subjects of different age.

Descriptive statistics	NE-group (17–71 years)	E-group (72–91 years)
N	525	126
Range	200–711a	272–541a
Mean ± SD	419 ± 110	396 ± 63
Median	410	394
Coefficient of variation	0.26b	0.16b

^a,bThe differences are statistically significant (p < 0.001). NE, non-elderly; E, elderly; SD, standard deviation.