## Infertility after spontaneous and induced abortion

## Usage

    data(infert)

## Format

1. | Education | 0 = 0-5 years
|  | 1 = 6-11 years
|  | 2 = 12+ years
2. | age | age in years of case
3. | parity | count
4. | number of prior | 0 = 0
|  | induced abortions 1 = 1
|  | 2 = 2 or more
5. | case status | 1 = case
|  | 0 = control
6. | number of prior | 0 = 0
|  | spontaneous abortions 1 = 1
|  | 2 = 2 or more
7. | matched set number | 1-83
8. | stratum number | 1-63

## Description

This is a matched case-control study dating from before the availability of conditional logistic regression.

## Note

One case with two prior spontaneous abortions and two prior induced abortions is omitted.

## Source

Trichopoulos et al. (1976) Br. J. of Obst. and Gynaec. vol.83, pp. 645-650.

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