armd Data (867 x 8)

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Description

Data from Age-Related Macular Degeneration (ARMD) clinical trial

Format

The armd data frame has 867 rows and 8 columns. It contains data for n=234 subjects stored in a long format with up to four rows for one subject.

subject

a factor with 234 levels 1, 2, 3, 4, 6, ..., 240

treat.f

a factor with 2 levels Placebo, Active

visual0

an integer vector with values ranging from 20 to 85

miss.pat

a factor with 8 levels ----, ---X, --X-, --XX, -XX-, ..., X-XX

time.f

a factor with 4 levels 4wks, 12wks, 24wks, 52wks

time

a numeric vector with values 4, 12, 24, 52

visual

an integer vector with values ranging from 3 to 85

tp

a numeric vector with values 1, 2, 3, 4 corresponding to time points 4, 12, 24, 52, respectively

Details

The ARMD data arise from a randomized multi-center clinical trial comparing an experimental treatment (interferon-alpha) versus placebo for patients diagnosed with ARMD.

Source

Pharmacological Therapy for Macular Degeneration Study Group (1997). Interferon alpha-IIA is ineffective for patients with choroidal neovascularization secondary to age-related macular degeneration. Results of a prospective randomized placebo-controlled clinical trial. Archives of Ophthalmology, 115, 865-872.

See Also

armd0, armd.wide

Examples

1