| variables | Technique | p-value | Sig. | |||
| Fenestration group | Non-fenestration group | |||||
| Age (mean in years) | 70.5 | 67.2 | >0.05 | NS | ||
| Sex | ||||||
| Male | 7 | 70% | 8 | 80% | >0.05 | NS |
| Female | 3 | 30% | 2 | 20% | ||