Table 1.

Maternal characteristics of opioid-dependent pregnant women maintained on methadone or buprenorphine

	Buprenorphine (n = 58)	Methadone (n = 73)
Variable	Mean (SD); % (n)	Mean (SD);% (n)
EGA at study entry (weeks)	18.7 (0.7)	18.7 (0.8)
Prior preterm birth	15.5% (n=9)	24.7% (n=18)
Typical daily cigarettes (#)	11.1 (6.2)	12.8 (6.6)
Positive UDS 2 weeks prior to delivery
Benzodiazepines	5.6% (n=3)	1.4% (n=1)
Cocaine	9.3% (n=5)	5.6% (n=4)
Opiates	11.1% (n=6)	5.6% (n=4)
SSRIs	27.8% (n=16)	21.9% (n=16)
Anxiolytics	40.4% (n=23)	27.8 % (n=20)

Note. EGA: estimated gestational age; UDS: urine drug screen; SSRIs: maternal receipt of selective serotonin reuptake inhibitors, antidepressants, or antipsychotics