TIME TO THIRD BIRTH

(used in examples 1.1, 3.2, 3.9, and 3.14)

 

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 second and third births for a selection of 16 116 women, and look at how the gender of the two older children affect the likelihood of a woman having a third birth.

 

Coding:

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

spacing:  time between first and second births (in days)

sibs:  genders of the first two children (1 = boy, boy; 2 = girl, girl; 3 = boy, girl; 4 = girl, boy)

time:  time from second birth to third 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.