Risk factors for predicting increased surgical drain output in patients after anterior cervical corpectomy and fusion

Table 4 Multivariate regression model predicting increased surgical drain output

Predictors	Odds ratio	95% confidence interval		P values
Predictors	Odds ratio	Lower limit	Upper limit	P values
Age	1.075	1.026	1.126	0.003
History of smoking	2.792	1.168	6.678	0.021
OPLL in the surgical level	2.107	1.381	3.213	0.001
Number of discs involved	2.764	1.402	5.447	0.003