Choice and management of negative pressure drainage in anterior cervical surgery

Table 2 Results of logistic regression analysis

Variable	P value	OR (95%CI)
Diseases1
Cervical spondylosis
OPLL	0.999	37813048.740 (0.000-)
Cervical disc herniation	0.999	57323980.170 (0.000-)
Cervical hyperextension injury and traumatic disc herniation	0.998	306720077.300 (0.000-)
Cervical tumor	1.000	0.575 (0.000-)
Drainage device (G/S)2	0.000	0.324 (0.186-0.563)
Gender	0.987	0.996 (0.590-1.681)
Age group
20-30 (yr)
30-40 (yr)	0.999	0.000 (0.000-)
40-50 (yr)	0.543	1.744 (0.291-10.468)
50-60 (yr)	0.669	0.738 (0.183-2.975)
60-70 (yr)	0.707	0.802 (0.254-2.537)
70-80 (yr)	0.968	0.978 (0.321-2.975)
80-90 (yr)	0.940	0.957 (0.304-3.015)

¹Abnormal values may be due to the huge difference of distribution of diseases.

²G/S means gastrointestinal decompression apparatus/silica gel ball. OR: Odds ratio; CI: Confidence interval; OPLL: Ossification of the posterior longitudinal ligament.