INS and diabetes mellitus: Serum glucose testing was performed in 37.2% (95% CI, 37.0%-37.4%) of those without diabetes, 45.7% (95% CI, 45.2%-46.1%) of those with diabetes not receiving medication, 47.7% (95% CI, 47.3%-48.1%) of those with diabetes receiving noninsulin medications, and 50.2% (95% CI, 49.5%-50.9%) of those with diabetes receiving insulin.