group

Male/female

(number)

Mean age ( $\overline{x}$ ± s, years)

Time of onset

( $\overline{x}$ ± s, month)

The vertebral body is involved

The highest incidence was L3-4 (%)

Two vertebral bodies were involved (n)

Three vertebral bodies were involved (n)

Group A

(n = 19)

10/9

42.1 ± 2.3

11.1 ± 2.2

17

2

42.10

Group B

(n = 20)

11/9

43.0 ± 1.8

12.0 ± 1.2

17

3

45.00