title: Social network types and functional dependency in older adults in Mexico.
abstract: BACKGROUND
  Social networks play a key role in caring for older adults. A better understanding of the characteristics of different social networks types (TSNs) in a given community provides useful information for designing policies to care for this age group. Therefore this study has three objectives: 1) To derive the TSNs among older adults affiliated with the Mexican Institute of Social Security; 2) To describe the main characteristics of the older adults in each TSN, including the instrumental and economic support they receive and their satisfaction with the network; 3) To determine the association between functional dependency and the type of social network.
  
  
  METHODS
  Secondary data analysis of the 2006 Survey of Autonomy and Dependency (N = 3,348). The TSNs were identified using the structural approach and cluster analysis. The association between functional dependency and the TSNs was evaluated with Poisson regression with robust variance analysis in which socio-demographic characteristics, lifestyle and medical history covariates were included.
  
  
  RESULTS
  We identified five TSNs: diverse with community participation (12.1%), diverse without community participation (44.3%); widowed (32.0%); nonfriends-restricted (7.6%); nonfamily-restricted (4.0%). Older adults belonging to widowed and restricted networks showed a higher proportion of dependency, negative self-rated health and depression. Older adults with functional dependency more likely belonged to a widowed network (adjusted prevalence ratio 1.5; 95%CI: 1.1-2.1).
  
  
  CONCLUSIONS
  The derived TSNs were similar to those described in developed countries. However, we identified the existence of a diverse network without community participation and a widowed network that have not been previously described. These TSNs and restricted networks represent a potential unmet need of social security affiliates.
authors.affiliation: Unidad de Investigación Epidemiológica y en Servicios de Salud Centro Médico Nacional Siglo XXI, Instituto Mexicano del Seguro Social, México.
authors.forename: Svetlana Vladislavovna
authors.initials: SV
authors.lastname: Doubova Dubova
authors.forename: Ricardo
authors.initials: R
authors.lastname: Pérez-Cuevas
authors.forename: Patricia
authors.initials: P
authors.lastname: Espinosa-Alarcón
authors.forename: Sergio
authors.initials: S
authors.lastname: Flores-Hernández
mesh_terms: D000203:Activities of Daily Living / Q000523:psychology*; D000368:Aged; D000369:Aged, 80 and over; D000704:Analysis of Variance; D005195:Family Relations; D005260:Female; D015577:Geriatric Assessment; D006801:Humans; D008019:Life Style; D008297:Male; D008800:Mexico; D026684:Personal Autonomy; D016012:Poisson Distribution; D011594:Psychometrics; D012044:Regression Analysis; D012943:Social Security; D012944:Social Support; D012959:Socioeconomic Factors; D017805:Widowhood / Q000523:psychology / Q000706:statistics & numerical data