Social isolation increases death risk

Findings of a recent study have linked social isolation to a higher risk of death. The study, says addressing social isolation holds promise if studies show interventions are effective, as they could be relatively simple and could influence other risk factors, as social isolation is also associated with hypertension, inflammation, physical inactivity, smoking, and other health risks.

Social isolation has been linked to higher mortality in studies comprising mostly white adults, yet associations among black adults are unclear. The new prospective cohort study, evaluated whether associations of social isolation with all-cause, cardiovascular disease and cancer mortality differed by race and sex.

Investigators weighted several standard components of social isolation -marital status, the frequency of religious service attendance and club meetings/group activities, and a number of close friends/relatives--giving a score of 0 (least isolated) or 1 (most isolated) on each of the factors for a total on a 5-point isolation scale.
For instance, someone who was married, frequently attended religious services, attended club meetings and/or group activities, and had seven or more close friends were given an isolation score of 0. Someone with none of those would have an isolation score of 4.
They found overall, the race seemed to be a stronger predictor of social isolation than sex; white men and white women were more likely to be in the least isolated category than black men and women. In the full sample, a statistically significant, positive dose-response relationship was found between social isolation and all-cause mortality risk over the 30-year follow-up period. However, associations were significantly stronger in the first 15 years of follow up.

Social isolation score was positively associated with heart disease (CVD) mortality in all subgroups. Although there was a positive association between social isolation score and cancer mortality among white men and white women, there was no association between social isolation score and cancer mortality among black men or black women. Each social isolation component was associated with all-cause and CVD mortality, and all but one (having fewer close friends/relatives) was associated with cancer mortality.

"Current findings indicate that a composite measure of social isolation is a robust predictor of mortality risk among men, women, blacks, and whites," write the authors. "Compared with the least isolated, the most socially isolated black men and women had a more than the 2-fold higher risk of death from any cause, and white men and women had 60 per cent and 84 per cent greater risks of death, respectfully."

The authors say as the era of precision medicine develops, several influences on health, including social factors, are expected to become more important to clinical care. Addressing social isolation is aligned with this more holistic approach, they write, saying: "Lack of interpersonal connections seems particularly detrimental." 

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