Question

The Diabetes Control and Complications Trial followed diabetes patients diagnosed with retinopathy before joining the study. They were randomly assigned to one of two treatments and monitored for 6 years. The study found that 152 of the 344 patients assigned to the conventional treatment showed a sustained progression of their original retinopathy. In contrast, only 76 of the 367 patients assigned to the intensive treatment had sustained retinopathy progression.

(a) Find a point estimate of the difference between the proportion of conventional treatment patients with sustained retinopathy progression and the proportion of intensive treatment patients with sustained retinopathy progression. (use 3 decimal places)

Answer 1