\name{Ectopic pregnancy}
\docType{data}
\alias{ectopic}
\title{Dataset of a case-control study looking at history of
abortion as a risk factor for ectopic pregnancy.}
\description{
This case-control study has one case series and two control groups.
The subjects were recruited based on three types of pregnancy outcome (outc):
EP = ectopic pregnancy
IA = women coming for induced abortion
Deli = women admitted for full-term delivery
Two exposure variables of interest are:
hia Previous induced abortion: "never IA" and "ever IA"
gravi Gravidity (number of pregnacy): "1-2", "3-4" and ">4"
}
\usage{data(ectopic)}
\format{A data frame containing 723 observations and 4 variables.}
\keyword{datasets}