pairdata: Early Treatment Diabetic Retinopathy Study

In umich-biostatistics/corrsurv: Two-Sample Tests for Correlated Survival Endpoints

Description

Enrolled 3711 patients with mild-to-severe nonproliferative or early proliferative diabetic retinopathy in both eyes from April 1980 to July 1985 - One eye per patient was randomized to early photocoagulation - The other eye deferred photocoagulation until detection of high-risk proliferative retinopathy. Survival endpoint: Time to severe visual loss (defined) as visual acuity < 5/00 at two consecutive visits) subject to censoring eventually detected a bene<ef><ac><81>t with early photocoagulation after 9 years of follow-up, only 5.5% of patients had experienced the event (lots of censoring)

Usage

pairdata

Format

A data.frame with 3711 observations (rows) and 6 variables (columns):

trt1

numeric, indicator for treatment group 1

x1

numeric, time to event for treatment group 1

delta1

numeric, 1 if subject died, 0 if censored

trt2

numeric, indicator for treatment group 2

x2

numeric, time to event for treatment group 2

delta2

numeric, 1 if subject died, 0 if censored

umich-biostatistics/corrsurv documentation built on Jan. 11, 2020, 2:03 a.m.