Table 1.

Enrollment and data collection^* among PIN Postpartum Study participants at 3- and 12-months postpartum

	3-months Postpartum (n=316)		12-months Postpartum (n=411)
	n	%	n	%
Successfully enrolled and completed data collection	181	57.3	204	49.6
Did not enroll due to:
… lack of interest or time	40	12.7	51	12.4
… moving or vacation/travel	5	1.6	22	5.3
…concern by staff so not invited	14	4.4	21	5.1
…lack of available accelerometer at the home visit	15	4.8	16	3.9
…visit at home was time constrained so not invited to participate	6	1.9	8	2
…ineligibility due to 3-month results	0	0	15	3.6
…other reasons	2	0.6	8	2
Successfully enrolled but did not complete data collection because:
…did not wear accelerometer or monitor malfunction	45	14.2	53	12.9
…accelerometer was lost, broken, or never returned	8	2.5	13	3.2

^*Successful enrollment was defined as completing the consent form and receiving an accelerometer. Successful data collection was defined by wearing the accelerometer and returning it to the study without monitor malfunction. In total, 688 women participated at 3-months postpartum and 550 women participated at 12-months postpartum in the PIN Postpartum Study starting in October 2002. The accelerometer portion of the study was added to the cohort in November 2004, with 316 women eligible at 3-months postpartum and 411 women eligible at 12-months postpartum.