A data frame with 1016 observations on the following 3 variables.
age
The age of the participants in the Blue Mountains Eye Study
sex
the gender of the participants, a factor with levels 1=`male' 2=`female'.
ageread
the age in which reading glasses were required.
References
Attebo, Karin, Paul Mitchell, and Wayne Smith (1996). "Visual acuity and the causes of visual loss in Australia: the Blue Mountains Eye Study." Ophthalmology 103.3:pp 357-364.