Table 2.

Confusion matrix of multivariate logistic regression model for predicting mean ISP for the first 24 h after surgery

	Normal ISP (predicted)	High ISP (predicted)	Total	% Correct
Normal ISP (actual)	25	8	33	77.8
High ISP (actual)	9	21	30	70.0
Total	34	29	63a	73.0

Classifier based on five factors: age group (< 30, 30–40, 40–50, 50–60, > 60), alcohol consumption (yes/no), spinal level of injury (cervical/thoracic/conus), extent of decompression (spinal alignment, spinal alignment + laminectomy, spinal alignment + laminectomy + duroplasty), and intraoperative hemorrhage (as  % of circulating volume: < 15, 15–30, 30–40, > 40). Area under receiver operating characteristic curve = 0.84

ISP intraspinal pressure

^a1/64 patients omitted because of missing intraoperative data