metafor (version 1.9-4)

dat.hackshaw1998: Studies on Lung Cancer Risk from ETS Exposure

Description

Results from 37 studies on the risk of lung cancer from environmental tobacco smoke (ETS) exposure.

Usage

dat.hackshaw1998

format

The data frame contains the following columns: lll{ study numeric study number author character first author of study year numeric publication year country character country where study was conducted design character either cohort or case-control study cases numeric number of lung cancer cases yi numeric log odds ratio vi numeric corresponding sampling variance }

source

Hackshaw, A. K., Law, M. R., & Wald, N. J. (1997). The accumulated evidence on lung cancer and environmental tobacco smoke. British Medical Journal, 315, 980--988. Hackshaw, A. K. (1998). Lung cancer and passive smoking. Statistical Methods in Medical Research, 7, 119--136.

Details

The dataset includes the results from 37 studies (4 cohort, 33 case-control) on the risk of lung cancer from environmental tobacco smoke (ETS) exposure from the spouse in women who are lifelong nonsmokers. Values of the log odds ratio greater than 0 indicate an increased risk of cancer in exposed women compared to women not exposed to ETS from their spouse.

Examples

### load data
dat <- get(data(dat.hackshaw1998))

### random-effects model using the log odds ratios
res <- rma(yi, vi, data=dat, method="DL")
res

### estimated average odds ratio with CI (and credibility/prediction interval)
predict(res, transf=exp, digits=2)