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Table 2: Descriptive statistics of fistulas
Overall (n = 120)
Fistula side 
 Left 44 (36.7%)
 Right 76 (63.3%)
Lumbar 
 No 117 (97.5%)
 Yes 3 (2.5%)
Thoracic 
 No 6 (5.0%)
 Yes 114 (95.0%)
Cervical 
 No 117 (97.5%)
 Yes 3 (2.5%)
Paraspinal drainage only 
 No 33 (27.5%)
 Yes 87 (72.5%)
Epidural drainage only 
 No 109 (90.8%)
 Yes 11 (9.2%)
Paraspinal and epidural drainage 
 No 98 (81.7%)
 Yes 22 (18.3%)
Bern score pretreatment 
 Mean (SD) 6.4 (2.3)
 Median (Q1, Q3) 7.0 (5.0, 8.0)
 Missing 1 (0.8%)

	Overall (n = 120)
Fistula side
Left	44 (36.7%)
Right	76 (63.3%)
Lumbar
No	117 (97.5%)
Yes	3 (2.5%)
Thoracic
No	6 (5.0%)
Yes	114 (95.0%)
Cervical
No	117 (97.5%)
Yes	3 (2.5%)
Paraspinal drainage only
No	33 (27.5%)
Yes	87 (72.5%)
Epidural drainage only
No	109 (90.8%)
Yes	11 (9.2%)
Paraspinal and epidural drainage
No	98 (81.7%)
Yes	22 (18.3%)
Bern score pretreatment
Mean (SD)	6.4 (2.3)
Median (Q1, Q3)	7.0 (5.0, 8.0)
Missing	1 (0.8%)