Table 3. Rates of dural injury and cerebrospinal fluid leakage according to region of spinal surgery.

The thoracic spine showed a tendency to have a higher percentage of dural injury and CSF leakage than the cervical or lumbar spine. 

CSF, cerebrospinal fluid

*p = 0.004 vs. cervical and lumbar, chi-square test

**p = 0.03 vs. cervical and lumbar, chi-square test

	cervical	thoracic	lumbar	p value
the ratio of dural injury to each surgery (n=176/4014)	3.2% (19/602)	7.8%* (25/321)	4.3% (132/3091)	0.004 (χ2=11.133)
the ratio of CSF leakage in cases with dural injury (n=22/176)	5.3% (1/19)	28%** (7/25)	11% (14/132)	0.03 (χ2=6.834)