Table 4:

Multivariable Model using Generalized Estimating Equations (GEE)^* Looking at Factors Predictive of Any Non-Prescribed Substance Use Post-Partum

Parameter	Estimate	Standard Error	aOR**	95% CI
Positive Delivery UDT	1.31	0.36	3.72	1.84	7.51
Positive 30d to Delivery hospitalization UDT	0.34	0.34	1.40	0.73	2.72
Positive 90-31d before Delivery	0.52	0.28	1.68	0.98	2.90
White non-Hispanic v. non-white race/ethnicity	−0.47	0.34	0.62	0.32	1.20
Public insurance v. Private/other	0.11	0.49	1.11	0.43	2.89
Methadone v. Buprenorphine treatment at delivery	0.67	0.25	1.96	1.20	3.22
Any psychiatric diagnosis	0.27	0.27	1.30	0.77	2.21
Hepatitis C	−0.038	0.014	0.97	0.94	0.99
Adequate v. Intermediate/ Inadequate Prenatal Care	0.46	0.26	1.59	0.95	2.64

OR, odds ratio; CI, confidence interval; UDT, urine drug test; d, days

^*GEE was used to account for clustering of deliveries by the same women across the study period. A binary outcome was used (0=no non-prescribed substances on toxicology testing within six months of delivery, 1=evidence of non-prescribed substances on toxicology testing within six months of delivery)

^**Model was adjusted for all covariates listed