In El Salvador from 1978 to 1988, contraceptive use among married women 15–44 years of age increased from 34% to 47%, and the total fertility rate declined from 6·3 to 4·6 children per woman. Most of this change took place from 1978 to 1985. Sterilization is the most prevalent method used, but nearly one-half of the women who are sterilized did not use any contraception before their operation. Few young couples use reversible methods of contraception to space births or delay the start of childbearing. On average, women wait 8 years after marriage and have nearly three children before they use contraception.

A longitudinal sample of 21-year-old Australians from Anglo-Australian, Greek and Southern Italian families was used to examine relationships of children's cognitive performance, family learning environments, adolescents' perceptions of family learning contexts, and measures of young adults' social status attainment. Generally, the findings using a regression approach indicated that there were ethnic group differences in the relations between parents' academic socialisation, children's cognitive performance, and measures of young adults' social status attainment. The results also showed that in each ethnic group, adolescents' perceptions of parents' support for learning had strong associations with young adults' status attainment.

In a random sample of 84 men and 167 women, medical considerations, an intransigent attitude of one partner or a fear of adverse effects, were related to the decision on which partner should seek sterilisation. Only 19% of couples felt that they had a real choice between male and female sterilisation.

The relationships among ethnicity, demographics, smoking and drinking habits, and maternal and infant health were examined in a sample of 171 low-income and low-risk Black, Caucasian, and Hispanic families. Few ethnic differences in the health status of the mothers and their infants emerged when ethnic differences were directly examined; however, a latent variable analysis indicated that ethnicity was related to smoking and drinking habits such that Caucasian mothers were more likely to smoke and drink. Smoking and drinking, in turn, led to smaller infant size at birth. Demographic differences found in level of income, education, and family composition suggest that low-income families are not necessarily homogeneous.

A survey of 232 households of the Mosuo minority group in Yunnan Province, People's Republic of China, suggested that polyandrous matriarchy did not raise the birth rate per household, but lowered the community birth rate by restricting many women's chances of marrying. The results imply that tolerance by the national government of polyandry within certain minority groups (e.g. Mosuos and Tibetans) will not prevent but may aid the attainment of zero population growth by China in the twenty-first century.

Self-reported height and childhood conditions among 1711 Danish male general workers born between 1923 and 1940 were analysed. No significant associations were found between adult height and father's occupation, growing up with both parents, paternal unemployment, sickness among the parents, parents receiving disability pension, economical problems in childhood, area of residence in childhood, and years at school. The study therefore provides no support for the hypothesis that poor childhood conditions are the cause of low adult height in this socially very homogeneous sample.