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<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd"><html xmlns="http://www.w3.org/1999/xhtml"><head><title>R: Infertility after Spontaneous and Induced Abortion</title> <meta http-equiv="Content-Type" content="text/html; charset=utf-8" /> <link rel="stylesheet" type="text/css" href="R.css" /> </head><body> <table width="100%" summary="page for infert {datasets}"><tr><td>infert {datasets}</td><td style="text-align: right;">R Documentation</td></tr></table> <h2>Infertility after Spontaneous and Induced Abortion</h2> <h3>Description</h3> <p>This is a matched case-control study dating from before the availability of conditional logistic regression. </p> <h3>Usage</h3> <pre>infert</pre> <h3>Format</h3> <table summary="Rd table"> <tr> <td style="text-align: right;"> 1. </td><td style="text-align: left;"> Education </td><td style="text-align: left;"> 0 = 0-5 years </td> </tr> <tr> <td style="text-align: right;"> </td><td style="text-align: left;"> </td><td style="text-align: left;"> 1 = 6-11 years </td> </tr> <tr> <td style="text-align: right;"> </td><td style="text-align: left;"> </td><td style="text-align: left;"> 2 = 12+ years </td> </tr> <tr> <td style="text-align: right;"> 2. </td><td style="text-align: left;"> age </td><td style="text-align: left;"> age in years of case </td> </tr> <tr> <td style="text-align: right;"> 3. </td><td style="text-align: left;"> parity </td><td style="text-align: left;"> count </td> </tr> <tr> <td style="text-align: right;"> 4. </td><td style="text-align: left;"> number of prior </td><td style="text-align: left;"> 0 = 0 </td> </tr> <tr> <td style="text-align: right;"> </td><td style="text-align: left;"> induced abortions </td><td style="text-align: left;"> 1 = 1 </td> </tr> <tr> <td style="text-align: right;"> </td><td style="text-align: left;"> </td><td style="text-align: left;"> 2 = 2 or more </td> </tr> <tr> <td style="text-align: right;"> 5. </td><td style="text-align: left;"> case status</td><td style="text-align: left;"> 1 = case </td> </tr> <tr> <td style="text-align: right;"> </td><td style="text-align: left;"> </td><td style="text-align: left;"> 0 = control </td> </tr> <tr> <td style="text-align: right;"> 6. </td><td style="text-align: left;"> number of prior </td><td style="text-align: left;"> 0 = 0 </td> </tr> <tr> <td style="text-align: right;"> </td><td style="text-align: left;"> spontaneous abortions </td><td style="text-align: left;"> 1 = 1 </td> </tr> <tr> <td style="text-align: right;"> </td><td style="text-align: left;"> </td><td style="text-align: left;"> 2 = 2 or more </td> </tr> <tr> <td style="text-align: right;"> 7. </td><td style="text-align: left;"> matched set number </td><td style="text-align: left;"> 1-83 </td> </tr> <tr> <td style="text-align: right;"> 8. </td><td style="text-align: left;"> stratum number </td><td style="text-align: left;"> 1-63</td> </tr> </table> <h3>Note</h3> <p>One case with two prior spontaneous abortions and two prior induced abortions is omitted. </p> <h3>Source</h3> <p>Trichopoulos <em>et al</em> (1976) <em>Br. J. of Obst. and Gynaec.</em> <b>83</b>, 645–650. </p> <h3>Examples</h3> <pre> require(stats) model1 <- glm(case ~ spontaneous+induced, data = infert, family = binomial()) summary(model1) ## adjusted for other potential confounders: summary(model2 <- glm(case ~ age+parity+education+spontaneous+induced, data = infert, family = binomial())) ## Really should be analysed by conditional logistic regression ## which is in the survival package if(require(survival)){ model3 <- clogit(case ~ spontaneous+induced+strata(stratum), data = infert) print(summary(model3)) detach() # survival (conflicts) } </pre> <hr /><div style="text-align: center;">[Package <em>datasets</em> version 3.6.0 <a href="00Index.html">Index</a>]</div> </body></html>