A Nested Case-Control Study of the Relationship between Salivary Inflammatory Mediators, Periodontal Parameters, and Preterm Birth in a Chinese Population

Table 5

Logistic regression analysis of variables and PTB.

Variables	Crude OR	Adjust OR	value	95% CI
BI	5.36	4.79	0.048	1.014 to 22.628
PD	12.65	3.23	0.41	0.202 to 51.547
PGE2 (pg/ml)	1.07	1.07	0.04	1.004 to 1.135
TNF-α (pg/ml)	1.52	1.35	0.16	0.891 to 2.041

BI: bleeding index; CI: confidence interval; OR: odds ratio; PD: probing depth; PGE2: prostaglandin E2; TNF-α: tumor necrosis factor-α.