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OBJECTIVE: To investigate the effect of cohabitation status in older men and women on (a) onset of disability at 3- and 4.5-year follow-up and (b) changes in functional ability between 3- and 4.5-year follow-up, and to analyze whether this effect was mediated by social participation. METHOD: A total of 2,533 nondisabled older men and women enrolled in the Danish Intervention Study on Preventive Home Visits constituted the study population. Data were collected by mailed questionnaires in 1998-1999, 2000, 2001-2002, and 2003. RESULTS: Living alone significantly increased the risk of onset of disability (T3 OR = 1.601.06-2.43, T4 OR = 1.741.22-2.47) and the risk of sustained poor functional ability (OR = 2.351.44-3.84) among men, but not among single-living women. Social participation mediated only a small part of the effect of cohabitation status on functional ability. DISCUSSION: Our results underline the importance of cohabitation/marriage for maintaining a high functional ability among older men.
Nilsson et al. (2007) studied this question.