Table 2.
Unmatched cohort | Matched cohort | |||||
---|---|---|---|---|---|---|
Conservative group | Surgical group | p-value | Conservative group | Surgical group | p-value | |
Dural sac cross-sectional area (mm2) at the most severe level | 57 ± 34 | 45 ± 30 | 0.014 | 51 ± 29 | 45 ± 32 | 0.323 |
Morphologic grade of stenosis at the most severe level | ||||||
Central-type stenosis by Schizas et al. | ||||||
A or B | 37 (25) | 8 (15) | 0.147 | 10 (21) | 7 (15) | 0.530 |
C | 66 (45) | 23 (43) | 21 (44) | 19 (40) | ||
D | 44 (30) | 23 (43) | 17 (35) | 22 (46) | ||
Foraminal-type stenosis by Lee et al. | ||||||
Grade 0 or 1 | 28 (19) | 7 (13) | 0.300 | 10 (21) | 7 (15) | 0.250 |
Grade 2 | 60 (41) | 19 (35) | 22 (46) | 17 (35) | ||
Grade 3 | 59 (40) | 28 (52) | 16 (33) | 24 (50) |
Data were presented by number (%) of patients or mean ± standard deviation.