Health selection into neighborhoods among patients enrolled in a clinical trial.

After median 10 years follow-up, which ranged from 5 to 18 years across patients, the intensive therapy group had experienced fewer diabetes related end-points, particularly a 25% risk reduction in microvascular complications, with a borderline non-significant decreased risk of macrovascular disease, and a longer complication-free interval, as measured by time until the development of at least one diabetes-related endpoint ( UK Prospective Diabetes Study (UKPDS) Group, 1998 ).

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