TIME TO SECOND BIRTH

(used in examples 1.1, 3.1, 3.7, 3.8, 3.10, and 10.2)

 

Background:

The Medical Birth Registry of Norway was established in 1967 and contains information on all births in Norway since that time. In the book we use data from the registry on the time between first and second births for a selection of 53 558 women, and look at how this is affected if the first child dies within one year of its birth. 

 

Coding:

age:   age of mother at first birth (in years)

sex:   sex of first child (1=boy, 2=girl)

death:   first child died within one year (0=no, 1=yes)

time:   time from first birth to second birth or censoring (in days)

status:   censoring indicator (0=censored, 1=birth)

 

Acknowledgement:

We thank The Medical Birth Registry of Norway for allowing us to use the data and Dr. Stein Emil Vollset for useful discussions and for making the data available.