Investigators were interested in the role of intensive therapyon the risk of developing diabetes-related eye disease(retinopathy) in the future. The results of the randomized clinicaltrial, conducted among diabetics, are presentedbelow.

Retinopathy

No retinopathy

Total

Intensive therapy

23

325

348

Standard therapy

91

287

378

Total

114

612

726

1. What type of clinical trial is this?

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