oc_breast: Twenty-two case-control studies on the relation between oral...
In dosresmeta: Multivariate Dose-Response Meta-Analysis

Description Format Author(s) References

The dataset reports the summarized dose-response results from twenty-two case-control studies on the relation between oral contraceptives use and breast cancer

A data frame with 113 observations on the following 14 variables:

`id`	id of the studies included in the analysis.
`author`	names of the first author.
`year`	year of publication.
`type`	code for study design.
`duration`	assigned dose levels.
`cases`	number of cases for each exposure level.
`n`	total number of subjects (type = "ir" or "cc") or person-years (type = "ir") for each exposure level.
`or`	adjusted odds ratios.
`lb`	lower bound for the confidence limits of the adjusted odds ratios.
`ub`	upper bound for the confidence limits of the adjusted odds ratios.
`logor`	natural logarithm of the adjusted odds ratios.
`se`	standard error for the logarithm of the adjusted odds ratios.
`menopause`	indicator variable for a study that included postmenopausal women (1 = yes).
`period`	final year of case accrual (surrogate for the changing formulations of oral contraceptives over time).