TABLE 2.

CT Measured Values of IVTD and LLLA in Case and Control Groups

GroupS	IVTD (mm) (95% CI)	LLLA (o) (95% CI)
sMTS	2.52 ± 0.50 (1.88–3.12)	124.41 ± 3.93 (119.37–129.45)
dMTS	2.29 ± 0.30 (1.77–2.82)	121.82 ± 5.37 (117.71–125.93)
oIVCS	5.93 ± 2.21 (5.13–6.74)	129.50 ± 5.93 (123.19–135.82)
Control group	4.34 ± 1.61 (4.18–4.50)	135.54 ± 12.85 (134.33–136.76)
Statistical analysis*	F = 32.649, P < 0.001; (Ps-d = 1.000, Ps-o<0.001, Ps-c<0.001, Pd-o<0.001, Pd-c<0.001,Po-c = 0.001)	F = 18.654, P < 0.001; (Ps-d = 1.000, Ps-o = 1.000, Ps-c<0.001, Pd-o = 0.274, Pd-c<0.001,Po-c = 0.393)

c indicates control group; d/dMTS, low lumbar degeneration-related May-Thurner syndrome; IVTD, diameter of the iliac vein tunnel; LLLA, lower lumbar lordosis angle; o/oIVCS, other cause iliac vein compression; s/sMTS, simple May-Thurner syndrome.

^*Bofferroni test was used in the statistical correction of multiple comparisons of means.