Journal:
:iranian journal of public health
0
m movahedi dept. of epidemiology, school of public health, shaheed beheshti university of medical sciences, te
t bishop genetic epidemiology unit, cancer research uk, st.james hospital, beckett street, ls9 7ft, leeds,
jh barrett genetic epidemiology unit, cancer research uk, st.james hospital, beckett street, ls9 7ft, leeds,
gr law centre for epidemiology and biostatistics, university of leeds, 30 hyde terrace, leeds, ls2 9ln, uk
background: a crucial part of a case-control study is the selection of a sample of controls that represent the base-population from which cases were drawn. controls may be matched to cases by one or more potentially important confounding variables, such as socioeconomic status. in the united kingdom, one method for control selection has been based on the patient list of the general practice ...
