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Table 2: Differences in imaging characteristics of cysts between responders and nonresponders
Responders Nonresponders P Value
LFSC size (mean) (SD) (mm) 10.1 (3.7) 9.3 (2.5) .62^{^a}
Cyst level (No.) (%) .66^{^b}
    L1–L2 1 (2) 0 (0) 
    L2–L3 3 (5) 1 (17) 
    L3–L4 6 (10) 1 (17) 
    L4–L5 35 (60) 2 (33) 
    L5–S1 13 (22) 2 (33) 
MRI central canal stenosis (No.) (%) .70^{^b}
    None 19 (33) 2 (33) 
    Mild 9 (15) 0 (0) 
    Moderate 11 (19) 1 (17) 
    Severe 19 (33) 3 (50) 
MRI signal intensity (No.) (%) .011^{^b}
    High T2 with a thin rim 39 (72) 1 (17) 
    High T2 with a thick rim 13 (24) 5 (83) 
    Low T2 2 (4) 0 (0) 
CT characteristics (No.) (%) .027^{^b}
    Calcified 14 (24) 4 (67) 
    Not calcified 44 (76) 2 (33) 
↵a P value based on the 2-sample t test of the difference between means.
↵b P value based on a χ² test of the difference in proportions.

	Responders	Nonresponders	P Value
LFSC size (mean) (SD) (mm)	10.1 (3.7)	9.3 (2.5)	.62^{^a}
Cyst level (No.) (%)			.66^{^b}
L1–L2	1 (2)	0 (0)
L2–L3	3 (5)	1 (17)
L3–L4	6 (10)	1 (17)
L4–L5	35 (60)	2 (33)
L5–S1	13 (22)	2 (33)
MRI central canal stenosis (No.) (%)			.70^{^b}
None	19 (33)	2 (33)
Mild	9 (15)	0 (0)
Moderate	11 (19)	1 (17)
Severe	19 (33)	3 (50)
MRI signal intensity (No.) (%)			.011^{^b}
High T2 with a thin rim	39 (72)	1 (17)
High T2 with a thick rim	13 (24)	5 (83)
Low T2	2 (4)	0 (0)
CT characteristics (No.) (%)			.027^{^b}
Calcified	14 (24)	4 (67)
Not calcified	44 (76)	2 (33)