PSY201 9.20.13 To Post

Primary analyses group differences in relative

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Unformatted text preview: io) 1.5 In the actual study, we are not tesIng one randomly chosen high ­risk child against a known set of populaIon parameters. * 1 Rather, we tested the differences in means between a sample of high ­risk children and a sample of low ­risk children. 0.5 We will learn about staIsIcal approaches that do this later in this course. 0 Low-risk High-risk n = 38 n = 51 Asok, Bernard, Roth, Rosen, & Dozier (2013) The fundamental principles of tesIng such hypotheses are the same. 5 Early-life stress and telomeres fer between low-risk and high-risk groups, and was not associated with child gender or age. Given the significant group differences and/or associations with primary variables of interest, log-transformed household income, birth weight, gender, and minority status were included as covariates in primary analyses. Primary analyses Group differences in relative telomere length. An analysis of covariance was conducted to examine group differences in telomere length, controlling for log-transformed household income, children’s birth weight, gender, and minority status. Telomere length was shorter in high-risk children compared to low-risk children, F (1, 83) ¼ 4.37, p , .05 (see Figure 2). Due to concerns about the nonindependence of data collected from siblings, analyses were also conducted excluding one child from each sibling pair. There were four sets of siblings in the full data set, but two sets of siblings had one child with outlying telomere data. Thus, only two children were excluded in this secondary analysis. The results remained significant when excluding one child from each sibling pair, F (1, 81) ¼ 4.79, p , .05. accounted for 19.8% of the variance, representing a significant change in R2 , F (3, 82) ¼ 5.44, p , .01. The Risk  Responsiveness interaction was significant (standardized b ¼ 20.94, p , .01), indicating that parental responsiveness moderated the association between risk group and telomere lengt...
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