TABLE 2—

Study Methodology, Outcomes, and Resources for the Telephone Follow-Up Surveys of the Pregnancy Risk Assessment Monitoring System‒Zika Postpartum Emergency Response (PRAMS-ZPER) Study: Puerto Rico, 2016–2018

	Phase 1	Phase 2
Data collection datesa	May 16, 2017, to July 12, 2017 (58 days)	February 12, 2018, to April 2, 2018 (50 days)
Data collection mode	Phone only	Phone only
Sampling	Proportional random sample of in-hospital survey respondents with a positive match to Demographic Registry’s birth certificate data AND all women with evidence of Zika virus infection during pregnancy (i.e., self-reported on phase 1 hospital survey or indicated on infant’s birth certificate)	All respondents to the maternal in-hospital survey with a positive match to Demographic Registry’s birth certificate data
Sample	Women: 1535	Women: 1485
Survey (length/time)	Maternal survey (37 questions/approximately 20 minutes to complete)	Maternal survey (49 questions/approximately 30 minutes to complete)
Response rate	76.6% (n = 1176)	82.8% (n = 1230)
Gift for participation	Packet with condoms, mosquito repellent, and educational materials	Packet with condoms, mosquito repellent, and educational materials
Personnel and study support: telephone interviewers	6 telephone interviewers	6 telephone interviewers

^aThe telephone follow-up surveys gathered supplemental data to address emerging data needs identified as the Zika outbreak progressed. The phase 1 telephone follow-up survey was implemented approximately 9 months after birth because of time needed to identify gaps, develop surveys and protocols, and obtain necessary approvals. Streamlining of methods during phase 2 allowed for implementation of the telephone follow-up survey approximately 3 months after birth.