Data for this Chartbook come from the 2007 National Survey of Adoptive Parents (NSAP) and from the 2007 National Survey of Children’s Health (NSCH). Estimates pertaining to the entire population of U.S. children are based on the NSCH sample, and estimates pertaining to adopted children are based on the NSAP sample.
The NSCH is a nationally representative survey of U.S. children under age 18. The NSCH uses the sampling frame of the National Immunization Survey (NIS), which contacts over a million households annually. After the NIS screener and/or survey are completed, the State and Local Area Integrated Telephone Survey (SLAITS) module is administered if households include any children under age 18. SLAITS has fielded the NSCH in 2003 and in 2007. In each household, one child under age 18 was randomly selected, and a parent or guardian knowledgeable about the child’s health answered questions about the child’s and the family’s health and well-being and provided information about demographic characteristics. The 2007 NSCH included information on 91,642 focal children. The overall response rate for the NSCH was 46.7 percent. This percentage accounts not only for the rate at which individuals who were contacted for the survey completed it, but also for the assumption that some portion of the sampled phone numbers whose eligibility could not be determined were, in fact, eligible for the NSCH interview. Among households in which someone completed the screener to determine their eligibility for the NSCH, the interview completion rate was 66 percent.36
The NSAP is nationally representative of adopted children ages 0 to 17 in English-speaking households in the United States in 2007, excluding those also living with a biological parent. Collaborative efforts between the Office of the Assistant Secretary for Planning and Evaluation (ASPE), the Administration for Children and Families (ACF), and the National Center for Health Statistics (NCHS) culminated in the development of the NSAP survey instrument and administration of the survey.37 The NSAP was an add-on module to the 2007 National Survey of Children’s Health (NSCH).38 If the focal child in the 2007 NSCH was adopted, an adoptive parent of the child was asked to participate in the NSAP, a 30-minute telephone survey. A total of 2,737 focal children were identified as having been adopted in the 2007 NSCH. NSAP interviews were carried out between April 2007 and June 2008 regarding 2,089 children. (Adopted children who were also living with a biological parent, whose adoptions were assumed to be primarily step-parent adoptions, were excluded from the NSAP.)39 The cooperation rate (that is, the rate at which NSAP interviews were completed for children who were identified as eligible based on the NSCH screener) was high, at 74.4 percent. However, when other factors are taken into account, such as the NSCH interview completion rate,40 the overall response rate for the NSAP was 34.6 percent. Weighting adjustments for NSAP nonresponse greatly reduce the likelihood of nonresponse bias.