Data from thirteen clinical studies evaluating the efficacy of the BCG vaccine for the prevention of tuberculosis.
log odds ratio in each study.
latitude, distance of each study from the equator, surrogate for the presence of environmental mycobacteria providing a level of natural immunity against tuberculosis.
year of the study.
estimated within-study variance.
Berkey, C.S., Hoaglin, D.C., Mosteller, F. and Colditz, G.A. (1995). A random-effects regression model for meta-analysis. Statistics in Medicine 14, 395–411.
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