Appendix Table A1.

Details Concerning Multivariate Analysis of Social Connectedness Measures

Dependent Variable	Description	Regression Model	Additional Controlsa
Network size	Ordinal	Generalized ordered logit	Number of children
Volume of contact w/network members	Count	Negative binomialb	Whether spouse/partner is in network, proportion of net members in household, average closeness to network members
Closeness to network members	Average of ordinal measures	Linear	Network size, whether spouse/partner is in network, prop. of net members in household, avg. frequency of contact w/net members, interaction b/w age & avg. freq of contact
Primary group members in net	Count	Poissonb	Number of children
Network density (i.e., number of ties among net members)	Count	Negative binomialc	Whether spouse/partner is in network, prop. of network members in household, average closeness to net members, proportion kin in network
Neighborly socializing	Ordinal	Generalized ordered logit	Number of neighbors R knows by name, number of children, net size, prop. of net members in household, volume of contact w/network members, inverse Mill’s ratiod
Religious services attendance	Ordinal	Generalized ordered logit	Religious preference, number of children, net size, volume of contact w/net members, prop. of network members in household
Volunteer work	Ordinal	Ordered logit	Number of children, net size, volume of contact w/net members, prop. of network members in household, inverse Mill’s ratiod
Organized group involvement	Ordinal	Ordered logit	Number of children, net size, volume of contact w/net members, prop. of network members in household, inverse Mill’s ratiod

^aEstimates for these variables are included in all final models, but are not shown to conserve space. All models also include: age, gender, race/ethnicity, education, retirement, widowhood and marital history, and self-rated health and functional health.

^bUses network size as the exposure variable.

^cUses number of possible alter-alter dyads (given the network’s size) as the exposure variable.

^dThis variable is included as a control for selective non-response into the leave-behind questionnaire (LBQ), which is the source of information about neighborly socializing, volunteering, and organized group involvement. LBQ response is modeled using the core independent variables, cognitive function, and measures of respondent candor and difficulty. The control is the ratio of the probability density of a normal curve to its corresponding cumulative probability (derived from predicted probabilities).