respir: Clinical trial comparing two treatments for a respiratory...
In ALA: Data sets and examples for the book "Applied Longitudinal Analysis"

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The data are from a clinical trial of patients with respiratory illness, where 111 patients from two different clinics were randomized to receive either placebo or an active treatment.

1	data(respir)

A data frame with 555 observations on the following 7 variables.

id: a factor with 56 levels
gender: a factor with levels F and M
center: a factor with levels C1 and C2
treatment: a factor with levels placebo and active
age: a numeric vector
visit: a numeric vector
status: a factor with levels poor and good (response)

Patients were examined at baseline and at four visits during treatment. At each examination, respiratory status (categorized as 1 = good, 0 = poor) was determined.

The original description says there are 111 patients, yet the data contain only 56 IDs.

Original variable names have been adapted to R conventions. Data were reshaped from wide to long format and the response named status. The center ID was prefixed with the letter “C” in the center variable, compared to the source.

http://biosun1.harvard.edu/~fitzmaur/ala

Stokes ME, Davis CS, Koch GG (1995) Categorical Data Analysis using the SAS System. Cary, NC: SAS Institute, Inc.