Study Methods
Publications under ‘Study Methods’ explain and describe the components and populations of both PRESTO and our Danish study “Snart Gravid”
This paper summarizes the design of the Boston University Pregnancy Study Online (PRESTO). In the first two years (2013-2015), 2,421 women and 693 male partners in the US and Canada enrolled in PRESTO.
This article describes the Danish Web-based Pregnancy Planning Study (“Snart Gravid”).
In the Danish Web-based Pregnancy Planning Study (“Snart Gravid”), we randomly assigned participants to receive a longer or shorter version of the same questionnaire at enrollment. Enrollment rates were similar for both versions.
After the first year of the Danish Web-based Pregnancy Planning Study (“Snart Gravid”), we evaluated the feasibility and cost-effectiveness of the study. We found that the study was successful in recruiting and retaining participants, and it was cost-effective.
We describe the first year of the Danish Web-based Pregnancy Planning Study (“Snart Gravid”) in detail. This article is in Danish.
We compared the accuracy of reported time to pregnancy by reporting every 2 months while trying to conceive vs. by recall during the first trimester of pregnancy. The two methods had similar results.
We analyzed the associations between several risk factors and pregnancy outcomes in the Snart Gravid cohort and among all births in Denmark, using data from the National Danish Birth Registry. Similar associations were found, suggesting that selection bias is not likely to be a major problem in Snart Gravid.
We compared measurement of diet and nutritional intake using a web-based questionnaire vs. a four-day food diary. The web-based questionnaire performed well.
We compared the costs and efficiency of several methods of recruiting participants to the Danish Web-based Pregnancy Planning Study. Over 80% of participants were enrolled via various online recruitment methods, which had a lower average cost per participant compared with “offline” methods such as flyers and press releases.
This article describes the Preconception Period analysis of Risks and Exposures Influencing health and Development (PrePARED) consortium. Through the PrePARED consortium, PRESTO will work together with several other studies of preconception health to answer important research questions related to fertility and pregnancy.
In a randomized study, we sent home pregnancy tests to 50% of participants with ≤6 cycles of pregnancy attempt time. Receiving a home pregnancy test made participants more likely to stay in the study, but did not influence their fecundability or timing of pregnancy detection.