To demonstrate the utility of the re-parameterized equation, we analyzed data from the NICHD Study of Early Child Care (NICHD-SECC). The NICHD-SECC was a 10-site study, with research sites across the United States (NICHD Early Child Care Research Network, 2005). A minimum of 100 participants was to be obtained at each site, and participating children and their mothers were enrolled in the study when children were one month of age.
