Preoperative prediction of sagittal imbalance in kyphosis secondary to ankylosing spondylitis after one-level three-column osteotomy

Table 4 Efficacy of these preoperative predictors with the threshold values to predict sagittal imbalance

Numbers of predictors met the thresholds	Cases	Sagittal balance	Sagittal imbalance	P value
No predictor met	9	9	0	/
One predictor met	3	2	1	0.250
Two predictors met	7	1	6	0.001^*
All predictors met	36	6	30	< 0.001^*

^* Compared with “No predictor met”, the difference was statistically significant (p < 0.05)

ISSN: 1471-2474