Table 1.
Demographic characteristics of each grade
| Grade | Male/female | Age (mean ± SD) and range |
|---|---|---|
| 3 | N = 6 (50 %)/N = 6 (50 %) | 51.5 ± 15.24 (16–75) |
| 4 | N = 8 (67 %)/N = 4 (33 %) | 50.2 ± 15.7 (20–70) |
| 5 | N = 10 (91 %)/N = 1 (9 %) | 62.1 ± 9.6 (40–75) |
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