Related Experiment Video
Updated: Aug 7, 2026

Measurement of Survival Time in Brachionus Rotifers: Synchronization of Maternal Conditions
Published on: July 22, 2016
Between-birth intervals in newly married Bulgarian families
Rumen S Stefanov1, Ivo D Dimitrov
1Department of Social Medicine and Health Management, Medical University, Plovdiv, 15A Vassil Aprilov St., 4002 Plovdiv, Bulgaria.
Unlabelled:
An essential component of the family planning of a newly married couple is determining not only the number of children but also the spacing of births.
Aim:
To study the preferences of newly married couples of Bulgarian ancestry from Plovdiv for between-birth intervals and factors that have effect on them.
Methods:
The present transversal study was designed to investigate family planning in young families of Bulgarian origin from the town of Plovdiv at the time of submission of documents for state registration of marriage. The primary sociological information was gathered by a direct individual inquiry of 384 families. The data were compared with data from a similar study performed in 1995.
Results:
Only one third of the women are willing to have a child immediately after marriage. Men prefer this to happen 1.61 +/- 0.07 year after the marriage while women favour longer protogenetic interval--1.84 +/- 0.06. The opinion of the spouses inquired about the age of women at last birth shows that there is statistically significant increase in this variable from 34.89 +/- 0.29 years in 1995 to 36.33 +/- 0.32 years in 2000. No statistically significant difference was found between the protogenetic intervals of 2000 and 1995.
Conclusions:
The increased age at marriage, the postponement of childbirth and increase in the anticipated age of last birth supports the thesis that the Bulgarian family type has undergone changes towards the family type characteristic for the countries in Western Europe.
Related Concept Videos
Population Growth
Applications of Life Tables
Equivalent Couples
Two couples are considered to be equivalent if they produce the same rotational effect on a rigid body. In other words, the two couples have the same magnitude and act in the same direction, causing the same angular displacement or acceleration in the body.
For instance, consider two couples lying in the plane of the page, with one having a pair of equal...
Energy Budgets and Reproductive Strategies
Cross-Sectional Research
Parental Care

