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Demographic profile of the patients in the two groups
| Variables | Autologous serum group | Umbilical cord serum group |
| Number of patients | 29 | 31 |
| Mean age (SD) (years)* | 47.8 (19.8) | 33.8 (16.8) |
| Sex distribution | M = 23 (80.6%) | M = 22 (72.4%) |
| F = 6 (19.3%) | F = 9 (27.6)% |
*For age distribution p = 0.004.
