As part of the study, detailed information was obtained at annual intervals from birth to age 15 years on any changes in family composition. (jamanetwork.com)
These dramatic changes are made all the more significant by the ways in which family composition appears to be related to important social, behavioral, and economic characteristics. (nationalaffairs.com)
Information on the age, sex, race, health, education and occupation of the individuals were collected along with data on family composition, income and geographical location. (ucl.ac.uk)