Table 4:

Estimated Cost per Study Participant

Randomization	Postpartum Home Visits	Postpartum Phone Consults	Biochemically Confirmed Abstinence	N	Mean Total Cost	Standard Deviation
Incentive Group	0–1	0–1	Yes	1	$124	.
			No	79	$49	$56
		2–3	Yes	0	.	.
			No	14	$138	$69
		4–5	Yes	0	.	.
			No	2	$211	$23
	2–3	0–1	Yes	2	$246	$71
			No	12	$165	$42
		2–3	Yes	7	$277	$50
			No	48	$236	$53
		4–5	Yes	8	$365	$49
			No	59	$298	$95
	4	0–1	Yes	0	.	.
			No	3	$278	$22
		2–3	Yes	6	$388	$21
			No	18	$356	$75
		4–5	Yes	50	$467	$79
			No	196	$431	$144
Control Group	0–1	0–1	Yes	1	$59	.
			No	135	$44	$92
		2–3	Yes	0	.	.
			No	36	$65	$48
		4–5	Yes	0	.	.
			No	5	$114	$50
	2–3	0–1	Yes	3	$114	$31
			No	47	$141	$108
		2–3	Yes	7	$141	$25
			No	87	$151	$93
		4–5	Yes	4	$184	$24
			No	39	$179	$57
	4	0–1	Yes	1	$164	.
			No	2	$240	$107
		2–3	Yes	8	$181	$17
			No	38	$193	$53
		4–5	Yes	23	$203	$36
			No	83	$205	$38

Total cost=Incentive costs+Service costs+Medication Costs