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. 2020 Aug 24;10:14135. doi: 10.1038/s41598-020-71145-0

Table 2.

Comparison of initial radiologic profile.

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.