Table 1 Composition of sample of vertebrae from the 71 humans, 36 chimpanzees, and 15 orangutans included in study

4

8

0

12

5

9

1

15

9

17

1

27

8

17

0

25

6

19

6

31

14

36

6

56

12

14

0

26

15

17

2

34

27

31

2

60

13

20

0

33

6

13

2

21

19

33

2

54