Table 1 Population and pooled sample characteristics

n

11

11

11

11

Age (years)

12.9 ± 1.8

13.2 ± 2.2

13.0 ± 1.4

13.4 ± 1.6

Male/female

11/0

11/0

11/0

11/0

DNA concentration (ng/μL)

 Spectrofluorimetry

14.5 ± 1.4

15.0 ± 1.1

15.3 ± 1.0

15.2 ± 1.4

 Spectrophotometry

19.8 ± 2.2

21.6 ± 2.7

20.9 ± 2.4

23.0 ± 3.3

260/280 ratio

1.86 ± 0.06

1.86 ± 0.04

1.84 ± 0.05

1.83 ± 0.08