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Table 4: 
Comparison of myelographic appearance of spinal meningeal diverticula
ControlSIHP Valuea
Morphology
    Round (No.) (%)20 (51)62 (52).946
    Multilobulated (No.) (%)19 (49)57 (48)
Size
    0–3 mm (No.) (%)9 (23)22 (18).711
    4–6 mm (No.) (%)23 (59)71 (60)
    >6 mm (No.) (%)7 (18)26 (22)
Location
    Cervical (No.) (%)2 (5)4 (3)0.050
    Upper thoracic (No.) (%)6 (15)33 (28)
    Lower thoracic (No.) (%)29 (75)65 (55)
    Lumbar (No.) (%)2 (5)17 (14)
  • ↵a P value based on the generalized estimating equations test of the difference between groups in proportions in morphologic categories while accounting for multiple observations per patient.