Table 1 Demographic data of age, sex, operation level-matched cohort
Category | Group U (N = 19) | Group B (N = 57) | P value | |
|---|---|---|---|---|
Age (yr) | 65.6 ± 10.7 | 65.3 ± 9.0 | 0.905 | |
Sex | M | 10 (52.6%) | 30 (52.6%) | 1.000 |
F | 9 (47.4%) | 27 (47.4%) | ||
Height (cm) | 160.0 ± 8.7 | 156.4 ± 8.8 | 0.125 | |
Weight (kg) | 66.4 ± 9.9 | 61.4 ± 9.5 | 0.053 | |
BMI (kg/m2) | 25.9 ± 2.4 | 25.0 ± 2.7 | 0.229 | |
BMD (T score) | −0.6 ± 1.6 | − 0.9 ± 1.3 | 0.515 | |
Smoking | Y | 5 (26.3%) | 6 (10.5%) | 0.090 |
N | 14 (73.7%) | 51 (89.5%) | ||
Number of Op. level | 1 | 9 (47.4%) | 27 (47.4%) | 1.000 |
2 | 10 (52.6%) | 30 (52.6%) | ||
Op. level | L3–4 | 1 (5.3%) | 3 (5.3%) | 0.014 |
L3–4-5 | 5 (26.3%) | 20 (35.1%) | ||
L4–5 | 2 (10.5%) | 21 (36.8%) | ||
L4–5-S1 | 5 (26.3%) | 10 (17.5%) | ||
L5-S1 | 6 (31.6%) | 3 (5.3%) | ||
Previous laminectomy | Yes | 5 (26.3%) | 1 (1.8%) | 0.003 |
Asymmetric disc collapsea | Yes | 6 (31.5%) | 5 (8.8%) | 0.014 |