Elderly group (≧65 year-old) | Young group (≤40 year-old) | P value | |
---|---|---|---|
Case number | n = 24 | n = 47 | |
Age (years)a | 71.2 ± 4.79 (65–80) | 33.9 ± 4.45 (23–39) | < 0.001* |
Male:Female | 13:11 | 31:16 | |
Follow-up (months)a | 22.6 ± 22.29 | 30.8 ± 21.52 | 0.145 |
Total levels | 40 | 57 | |
 one-level | 8 | 37 | |
 two-level | 16 | 10 | |
Level distribution | 0.253 | ||
 C3–4 | 4 | 2 | |
 C4–5 | 15 | 16 | |
 C5–6 | 17 | 35 | |
 C6–7 | 4 | 4 | |
Blood loss (ml)a | 171.4 ± 164.75 | 115.2 ± 131.41 | 0.178 |
Operative time (min)a | 239.4 ± 81.40 | 178.6 ± 58.00 | 0.008* |