Table 1 Descriptive characteristics of unrelated individuals and twins

N

52

65

26

32

17

30

Age (years)

21 ± 2

21 ± 2^bb

23 ± 5

24 ± 7

20 ± 2^dd

22 ± 2^aa

Body mass (kg)

76.0 ± 10.1

63.4 ± 7.9^aaa

72.9 ± 10.7

63.7 ± 12.5^aa

71.7 ± 14.2

61.1 ± 8.5^aa

Height (m)

1.85 ± 0.06

1.70 ± 0.06^aaa

1.81 ± 0.09

1.69 ± 0.07^aaa

1.82 ± 0.05

1.69 ± 0.06^aaa

BMI (kg/m²)

22.3 ± 2.4

21.8 ± 2.6

22.2 ± 2.7

22.2 ± 4.6

21.4 ± 3.4

21.4 ± 2.6

%BF

14.8 ± 6.1^c

26.8 ± 4.9^aaa,bb

21.3 ± 6.2

29.7 ± 8.9^aaa

15.9 ± 6.8^d

29.6 ± 6.2^aaa

HPA (Mcnts/day)

3,761 ± 813

3,796 ± 718

3,862 ± 965

3,804 ± 1,152

3,884 ± 1,058

3,520 ± 842

PAL

1.82 ± 0.13

1.83 ± 0.12

1.84 ± 0.16

1.83 ± 0.19

1.84 ± 0.17

1.78 ± 0.14

Low (min/day)

1,403 (20)

1,400 (20)^bb

1,393 (28)

1,405 (27)

1,409 (21)

1,412 (21)

Mod (min/day)

27 (13)

30 (15)^{a, bb}

38 (22)

25 (18)

25 (14)

22 (16)

High (min/day)

9 (11)^c

8 (8)^b

5 (8)

7 (8)

4 (8)

4 (5)