Add Health Case Study

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Measures from Add Health Below is a detailed description of the measures that were used from Add Health (all measures are summarized in Table 2).

Abortions & Births
The quality analyses used data on abortions and births from Wave 4 of Add Health. In Wave 4, participants filled out a table of pregnancies, and were asked: “How did this pregnancy end?” The following response options were given: 1) Pregnancy has not yet ended; 2) live birth; 3) single, stillbirth; 4) miscarriage; 5) multiple, involving both a live birth and another outcome; 6) multiple, no live birth; and 7) abortion. Participants were also asked to provide the year and month for each pregnancy outcome. Using responses to this question, a total number of abortions was compiled for each year in Wave 4.
The Poisson analyses use the pregnancy histories provided in Wave 4 as well. However, the analyses include women who reported no abortions in the modeling process. More …show more content…

Unlike other longitudinal surveys, Add Health asked for complete pregnancy histories in multiple waves of the survey (in Waves 3 and 4). Additionally, data from Wave 1 and 2 asked about prior pregnancies in 1994 and 1994-1996, respectively. In Wave 1 and Wave 2, participants were asked if they had even been pregnant. They were then asked for each pregnancy reported, “How did this pregnancy end?” The participants were given the following response choices in Wave 1: 1) It has not ended; you are still pregnant; 2) a live birth; 3) stillbirth or miscarriage; 4) an abortion. In Wave 2, the following response options were provided: 1) It has not ended; you are still pregnant; 2) a live birth; 3) stillbirth; 4) miscarriage; and 5) an abortion. Women were also asked to provide the month and year of each pregnancy outcome. These pregnancy histories were to trace reporting of abortions reported in Wave 4 and Wave

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