ONLINE SUPPLEMENTAL MATERIAL Extended Presentation of Item Testing and Selection Results to accompany Health Psychology article: Assessing Social Support, Companionship, and Distress: NIH Toolbox Adult Social Relationship Scales Extended Presentation of Item Testing and Selection Results Psychometric analyses to support the item selection process for the adult NIH Toolbox Social Relationship (SR) scales were conducted separately for items representing the social support, companionship and social distress conceptual domains. As detailed in the primary article text, the process of item testing and selection occurred over a series of four stages: (1) initial item level evaluation; (2) dimensionality analyses; (3) IRT analyses; and (4) final item selection (including CAT simulations). Detailed results at each stage of the item testing and selection process for each of the three Social Relationship concepts is provided in the below text and summarized in Figure 1 of this supplement. Social Support Scales
ONLINE SUPPLEMENTAL MATERIAL Extended Presentation of Item Testing and Selection Results to accompany Health Psychology article: Assessing Social Support, Companionship, and Distress: NIH Toolbox Adult Social Relationship Scales Extended Presentation of Item Testing and Selection Results Psychometric analyses to support the item selection process for the adult NIH Toolbox Social Relationship (SR) scales were conducted separately for items representing the social support, companionship and social distress conceptual domains. As detailed in the primary article text, the process of item testing and selection occurred over a series of four stages: (1) initial item level evaluation; (2) dimensionality analyses; (3) IRT analyses; and (4) final item selection (including CAT simulations). Detailed results at each stage of the item testing and selection process for each of the three Social Relationship concepts is provided in the below text and summarized in Figure 1 of this supplement. Social Support Scales
HEA-HEA2-Cyranowski20110572-RR-F1.docx