This paper examines the knowledge and use of contraception, and abortion decision-making of 212 Australian women who were seeking a repeat abortion in 1980. The analysis of questionnaires from a pregnancy and family planning clinic revealed that most women were seeking their second abortion. Single women were more likely to claim a slight knowledge of contraception and irregular use of contraceptives, and to attribute pregnancy to the failure of the pill. Women in de facto or cohabitation relationships were most likely to rate the abortion decision as difficult. Of the women who returned post-abortion questionnaires, almost all felt they had made the correct decision.

The lactational histories of 500 Sudanese women were studied retrospectively to examine postpartum lactational amenorrhoea as a method of family planning. Particular attention was given to the factors affecting postpartum lactational amenorrhoea, including supplementary feeding and the use of modern contraceptive methods. Breast-feeding was overwhelmingly practised (90%) among this sample, which was roughly representative of the Sudanese population as a whole. The prevalence of amenorrhoea among this group of lactating women was quite high (73%). Duration of lactational amenorrhoea ranged from 2 to 36 months with a median of 12 months.

Introduction of supplementary feeding had little effect on lactational amenorrhoea up to the 9th month of breast-feeding. Beyond the 12th month of breast-feeding, lactational amenorrhoea was significantly prolonged by postponing the introduction of supplementary feeding until the 4th month or later.

Ovulation, and hence conception, during lactational amenorrhoea was unpredictable. It occurred as early as the 3rd or as late as the 36th month postpartum. Conceptions interrupting lactational amenorrhoea soon after delivery (3–9 months) were more frequent among primiparous women. The failure rate of lactational amenorrhoea as a contraceptive was 8·4%. Though extremely high compared to that of the pill, lactational amenorrhoea was more useful as a fertility control mechanism because, in this study, a high proportion of women initiated pill use, but soon discontinued it because of side effects. Modern contraceptive practice was not prevalent. Amenorrhoeic mothers accepted the pill after the 6th month postpartum (41%), compared to lactating mothers whose menses had returned who started it much earlier. Forty-nine percent of the women studied relied completely on the protection of lactational amenorrhoea. Fifty-seven percent of all lactating women who used the combined pill reported a reduction in milk production. There are several policy implications of this study.

The surnames of all adult residents of five neighbouring communities in the fenlands of Cambridgeshire are compared with each other and with those of the 165,533 persons married in England and Wales in the period January to March 1975. Among the villages the average coefficient of relationship by isonymy (Ri) is 76 × 10−5. The villages nearer together may have a tendency to higher values of Ri: the correlation of Ri with the natural log of distance between villages is −0·49, p = 0·07. The surnames of the five villages give a weighted average Ri with the whole area about 25 miles of 54 × 10−5 and with a zone 25–40 miles away of 45 × 10−5, whereas Ri with all England and Wales is 42 × 10−5. Rare surnames show a much sharper gradient and contribute approximately twice as much to the coefficient in the 25–40 mile zone and six times as much within 25 miles as found with all England and Wales. Moderately frequent surnames and even common surnames show the same gradient, but to a lesser degree. In the part of Cambridgeshire studied, the present distribution of surnames indicates a slight but appreciable local isolation, with the degree of relationship decreasing from among local villages to that between the villages and all England and Wales. This pattern is consistent with the theory of genetic inbreeding based on distance but there is considerable variability in individual instances.

Using data collected over a 12-month period (1977–78) from more than 15,000 hospital deliveries at a single maternity hospital in Tehran, Iran, we have examined the effects of previous pregnancy outcomes, breast-feeding and contraceptive use on birth spacing. The outcomes of previous pregnancies, particularly the most recent, significantly affect the length of the pregnancy interval, and so does breast-feeding. Pregnancy outcomes influence both breast-feeding and subsequent contraceptive behaviour, and breast-feeding adds to the degree of protection against pregnancy afforded by conventional contraception. Improved survivorship increases the length of pregnancy intervals most when it results in increased use of contraception and when breast-feeding is commonly practised for extended periods.

The natural region of the Jara, with an area of 2500 km2 occupies much of the south west of the province of Toledo, and extends into the provinces of Caceres and Ciudad Real. It is situated between the Tajo and Guadiana rivers, south of the town of Talavera de la Reina, the centre of the economic life in this region. Its highlands are covered with xerophytic vegetation, of which the most common plant is the jara (Cistus ladaniferus), from which this zone takes it name, (Fig. 1). It has been occupied from the neolithic period onwards by peoples of different origins, e.g. Romans, Muslims, Jews, Mozarabs (Jimenez de Gregorio, 1959) but the present population derives from settlement from the north of the Tajo river beginning in the 14th century following the upheavals of the Moslem–Christian wars.

The influence of fertility preferences on contraceptive use is examined among a sample of low income, rural Egyptian women. The findings reveal that while overall use of contraceptives was at modest levels, one-third of respondents who wanted no more children were currently practising contraception. Moreover, fertility preference emerged as the strongest predictor of contraception among the series of social and demographic factors examined.

Major findings from an analysis of demographic information collected in a 1979 survey in the Yemen Arab Republic (North Yemen) are that: levels of contraceptive use are extremely low in the rural areas that constitute most of the nation and considerably higher in the capital, Sana'a; fertility is very high and, until recently, was higher in Sana'a than in rural areas; mortality of children is very high with small urban–rural differentials; breast-feeding durations tend to be short, considering Yemen's extremely low level of development; and, female infants appear to be breast-fed longer than male infants in Sana'a, a phenomenon never previously documented. It is argued that the observed convergence between fertility levels in Sana'a and rural Yemen results from increased contraception in Sana'a, which offsets fertility differences introduced by longer breast-feeding in rural areas.

Cross-sectional and longitudinal study of a large sample confirms that mean marital coital rates decline very rapidly over the first year of marriage. They seem to halve over the first year of marriage, and then they take perhaps another 20 years to halve again. This pattern of decline is interpreted as evidence against the suggestion that coital rates are closely related to female hormone levels.

The higher correlation of marital coital rates with wife's age than with husband's age, it is argued here, is because wife's age is more closely associated than husband's age with duration of marriage (here seen as the most important of these three variables in the determination of coital rates). This is because of the substantially smaller variance of wife's age at marriage than husband's age at marriage.

Adult members of a kindred with various cases of Fabry's disease were asked by questionnaire about their attitudes and behaviour towards prospective genetic counselling. All individuals were aware of the fact that the disease occurred in their family and that it is hereditary, but none had a correct understanding of its inheritance. The disease was considered to be severe and the general attitude was that it should be prevented. Elective abortion after prenatal diagnosis was recommended by the majority, but some would prefer to abstain from having children. Prospective counselling was received positively even though it provoked anxiety in some of the counselled persons. The counselling has so far had the result that two heterozygous females asked for prenatal investigation. But when affected male fetuses were detected after prenatal diagnosis abortion was rejected in both cases. The reasons for this were not considered to be typical. It is concluded that prospective genetic counselling for Fabry's disease should be offered to other families, even though it may be expected that some will choose not to prevent further cases.

The method of decomposition is applied to evaluate the role played by fertility and changing nuptiality patterns in the number of legitimate live births in Ireland, 1962–77. In recent years there has been a demographic ‘transformation’ in Ireland with increasing proportions marrying and at younger ages than previously while the crude birth rate has remained one of the highest in Western Europe.

The analysis shows that the upward trend in births between 1962 and 1977 was due to more women marrying than in previous years and marrying at younger ages, but that age-specific birth rates have declined dramatically.

It is postulated that both the increasing nuptiality and the decreasing marital fertility have been occasioned by the increasing use of ‘artificial’ contraception in Ireland.