study: Study ID
d1: Number of depression events in treatment group
n1: Number of observations in treatment group
d0: Number of depression events in control group
n0: Number of observations in control group
data(varenicline)A data frame with 29 rows and 5 variables
Thomas, K. H., Martin, R. M., Knipe, D. W., Higgins, J. P., Gunnell, D. (2015). Risk of neuropsychiatric adverse events associated with varenicline: systematic review and meta-analysis. BMJ. 350: h1109.