Study links social isolation to higher risk of death

"They found overall, 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."