In Denmark the number of births and induced abortions among teenagers has reduced and teenage parenthood is now rare. This paper evaluates the correlation between this observed fertility and reported sexual and contraceptive behaviour. In 1989 a sample of 16–20-year-olds in Denmark was selected at random and personally interviewed about sexual and contraceptive behaviour. Ninety-five per cent of the young women who had experienced sexual intercourse used contraception at the most recent sexual intercourse. In order to support the validity of this finding a model was developed to estimate an expected number of conceptions in the age groups concerned. The model included both the information on coital frequency and use of contraception from the questionnaire and available efficacy rates on contraception. The estimates derived by the model were compared with the registered number of births and induced abortions derived from public registers. The analysis revealed a high accordance between the estimated number of conceptions and the registered number of births and induced abortions for each age group. This underlines the validity of the data on sexual and contraceptive behaviour sampled among teenagers in Denmark. The findings indicate that contraceptive failure is a much greater problem than non-use of contraception for teenagers in Denmark.

The surname is a cultural trait that is extremely useful for historical and linguistic studies and can effectively be used as a genetic marker. In many human populations the surname is inherited in the paternal lineage, and can therefore be considered a marker for the Y chromosome. In this study, surnames were recorded from the white pages of telephone directories in current use in Corsica in 1993. All surnames present in thirteen villages scattered over the whole island and covering the main historical regions were transcribed. Surname variability was found to be higher in coastal villages, and lower in more isolated communities. The isonymy detected among the thirteen villages allowed the calculation of kinship values, visualized in a tree showing two main clusters, one referring to the northern villages and one encompassing the villages of the south. The pattern reflects the administrative division of the island, with the exception of Vico, which belongs to the southern administrative region but is geographically close to the northern villages, and Ghisoni, which belongs to the northern district but is more similar to the village of Bastelica in the southern district. The data presented here show a structure in the surname distribution that is in substantial agreement with the geographical patterns. The kinship values are consistent with a moderated gene flow among villages producing a surname structure according to the geographic features of the territory.

In the 1999 Galton Lecture for the annual conference of The Galton Institute, the author summarizes the main elements of Galton’s ideas about human mental ability and the research paradigm they generated, including the concept of ‘general’ mental ability, its hereditary component, its physical basis, racial differences, and methods for measuring individual differences in general ability. Although the conclusions Galton drew from his empirical studies were seldom compelling for lack of the needed technology and methods of statistical inference in his day, contemporary research has generally borne out most of Galton’s original and largely intuitive ideas, which still inspire mainstream scientific research on intelligence.

What is the cost of living in the Papua New Guinea highlands? An answer is sought using a time and energy accounting approach. The subsistence regime of Wola-speaking highlanders, the subjects of this investigation, comprises three components. The principal one is horticulture: people clearing gardens from forest and grassland, with tuberous crops predominating, notably sweet potato. The second component comprises animal rearing, notably of domestic pigs. The third, and least important, is hunting and gathering for food in the forest. The calculated returns on investments in these subsistence domains vary considerably. Gardens return in their crops between ten and fifteen times the energy expended in cultivation. Pigs may also give a good return, of four to five times the energy invested in rearing them, if slaughtered when adult, but people regularly keep animals for years and may incur negative energy returns on their labour investments. This relates to the high cultural premium put on pigs. Foraging for food is also energetically costly, the Wola expending four times more energy on these activities than they gain in return from the food they secure. This analysis of energy gains and losses challenges the relative notion of affluence as applied to foragers, by reviewing it in the comparative context of subsistence horticulture.

The sociodemographic characteristics of abortion seekers and the reasons they give for procuring termination were studied in 356 clients selected from two abortion clinics in the city of Colombo. Nearly 80% were Buddhists and about 10% were Christians. Almost all had some formal education but only 20% were employed outside the home. Over 95% were currently married and at the peak of their childbearing age. More than one-half were aged 30 years or over, while adolescents only constituted about 3%. Fourteen per cent were nulliparous and about two-thirds had one or two living children at the time of obtaining the abortion. A significantly high proportion also had a very young child. In total, the 356 women had had 1130 pregnancies, and the mean rate of abortion was 42 per 100 pregnancies. Over one-quarter had had more than one abortion and about 10% had had three or more. Almost all abortions were performed within the first trimester with a mean gestation period of 6 weeks. About one-third of the clients were using some method of contraception at the time they became pregnant. The most common reasons cited for the present abortion were ‘pregnancy too soon after previous delivery’, ‘no more children desired’ or ‘curtailment of opportunity for foreign employment’. Unmarried women constitute a special group of abortion seekers who have different needs and behave differently from married women. Their needs are not currently being met by reproductive health programmes in Sri Lanka, and it is important that they should be given special attention in the future. An interesting finding is that a significant minority of the abortion seekers answered negatively to the question regarding providing medical facilities for abortions without difficulty. This underscores the ambivalence many people have to abortion.

Reproductive characteristics at high altitude are described based on the reproductive histories of 720 Aymara women, collected in 1998 and 1999 in a group of twelve peasant communities at a mean altitude of 4000 m in the Bolivian Altiplano. The reproductive pattern is shaped by a late onset of childbearing, associated with a rather short reproductive span and large birth intervals. Environmental conditions could explain the particularly late age at menarche of rural girls compared with their urban counterparts, whereas the age at first birth is likely to be under cultural control. The short reproductive span appears to result from a large mean interval between last birth and menopause, which is essentially determined by cultural decisions. The birth intervals, which are longer than in many traditional societies, could be the result of a slower restoration of postpartum fecundability induced by the hard way of life inherent in the Altiplano (including poor sanitary and nutritional conditions and high workload), perhaps aggravated by hypoxia. However, a secular trend in fertility is perceptible, towards earlier menarche, earlier age at first birth, increasing reproductive span and a slight increase in live births and surviving offspring, which is probably the result of a slow improvement in living conditions. The existence of birth control on the one hand, and a total fertility rate averaging six live births among the couples who do not practise contraception on the other, are other arguments against the hypothesis of a low natural fecundity in these Aymara groups.

This article examines the effect of access to health infrastructure, personnel and services on children’s nutritional status in rural Nepal. Data for the study come from the 1996 Nepal Living Standards Survey, which includes individual- and household-level information on children’s nutritional status and its environmental and socioeconomic determinants, and community-level information on the availability of health care infrastructure, personnel and services. The study uses a structural modelling approach to assess the relative contributions of the health care supply environment on children’s anthropometric status via the pathway of maternal and child health (MCH) service use. The findings suggest that improvements in the availability of outreach clinics and the structural quality of the closest public facility would be expected to have statistically significant and large effects on the use of MCH services, and that increases in MCH service use would have a statistically significant impact on weight-for-age, but not weight-for-height or height-for-age. The overall impact of the heath care supply environment on nutritional status is assessed through a series of policy simulations.

Many studies in the last 45 years have shown that women prefer a boy to a girl for their first-born child, suggesting that this preference is universal in Western societies. A careful examination of these studies reveals, however, that the subjects were often women who were not pregnant and/or students. A review of sixteen studies with first-time-pregnant women showed that in most cases the opposite was true, namely, that a girl was desired more often than a boy, especially during the last two decades (from 1981 to 1996). Data concerning expectant fathers, however, indicate that they prefer a boy rather than a girl. A preference for a boy first was also observe for both non-expectant males and females. Women’s preference for a male child decreased and men’s preference increased slightly when the two sub-periods (before 1980 vs after 1981) were compared. A difference between men and women is, however, evident whatever the sub-period: men more often prefer a boy than women. These findings suggest that something specific about being pregnant is related to the preference for a girl first.

While the macro-level association between poverty and child malnutrition is well-established, the concept of ‘poverty’ and its operationalization in terms of measures of socioeconomic status shed little or no light on the mechanisms through which malnutrition is created and/or prevented. This paper investigates a woman’s social power, one such mechanism that may mediate the impact of poverty on childhood nutrition. This micro-level factor is examined using survey data on 402 children 5 years of age and younger and their 261 Fulbe mothers in rural Mali. A conceptual model of social power is developed and used to test the hypothesis that a mother’s social power can predict her child’s nutritional status.

This study examines fertility decline that is larger than expected on the basis of recorded increases in contraceptive prevalence in Ghana. The primary sources of data are three Demographic and Health Surveys (DHS) conducted in the country in 1988, 1993 and 1998. First, the trend in fertility and contraceptive prevalence in Ghana is considered and compared with the trend that would be expected on the basis of prior research. Next, an attempt is made to uncover the explanation behind this unexpected trend. Measures of the quality of the survey data are looked at, as well as trends in the proximate determinants of fertility: contraceptive use, marriage and sexual activity, postpartum insusceptibility and induced abortion. Finally, evidence is presented that couples adjust their coital frequency in accordance with their fertility preferences, behaviour that would influence fertility rates but would not be captured by conventional measures of the proximate determinants of fertility.

This paper is based on a study aimed at understanding the perceptions of men to induced abortion and contraceptive use within marriage in rural Zimbabwe. Two qualitative methods were combined. Men were found to view abortion not as a reproductive health problem for women. Instead, they described abortion as a sign of illicit sexual activity and contraceptive use as a strategy married women use to conceal their involvement in extramarital sexual activity. Men felt anxious and vulnerable for lack of control over women. In the absence of verbal communication on sexual matters, women and men resort to what are called here ‘hide-and-seek’ strategies, where women acquire and use contraceptives secretly while men search for evidence of such use. It is concluded that promoting women’s sexual and reproductive health requires both short- and long-term strategies. The short-term strategy would entail providing women with reproductive technology they can use without risking violence. The long-term strategy would entail understanding men’s concerns and the way these are manifested. In turn this requires the use of methodologies that encourage dialogue with research participants, in order to capture their deep meanings and experiences.

From 1966 to 1990 there was a marked rise in the use of voluntary sterilization in Flanders, followed by a fall in women under the age of 40. In the last three decades a remarkable change has occurred in the choice between male and female sterilization. Compared with many other European countries, sterilization of men and women is widely practised in Flanders. In 1996 40% of 40- to 44-year-old women underwent voluntarily sterilization or had voluntarily sterilized partners. Additionally, another 9% of these women were sterilized for medical reasons. Voluntarily sterilized couples are on average older than non-sterilized couples, and, obviously, consider their families to be complete. For couples with a complete family, parity is the most important predictor in the choice between sterilization and non-sterilization. Regularly practising Catholics undergo sterilization least. Also, highly educated couples are less likely to have a sterilization. Couples who ever experienced a contraceptive failure choose sterilization more. Voluntary sterilization has no substantial effect on the fertility of the population since the effect on the prevented numbers of both wanted and unwanted births appears to be small. However, if voluntary sterilization did not occur, differences in fertility within the population would probably increase. It is presumed that the popularity of voluntary sterilization in Flanders has passed its peak and that its use will decline in the near future.

African men play important roles in the decisions about family life, including fertility and family planning. However, fertility and family planning research and programmes have ignored their roles in the past, focusing only on women’s behaviours. Since the 1994 International Conference on Population and Development (ICPD), interest in men’s involvement in reproductive health has increased. Unfortunately, data on their knowledge and use of contraception are generally scanty. This paper examines knowledge and use of contraception among ever-married men in Nigeria. A total of 1451 ever-married men aged 18–55 were interviewed in Imo and Ondo States, Nigeria. The findings reveal that men’s level of contraceptive knowledge is high in the study areas. About 90% knew at least one method of family planning. Furthermore, the level of contraceptive use among married men is such that men could participate in family planning activities if there were adequate programmes to involve them. Men in the sample areas were found not only to support their spouses’ use of contraceptives, but were actually using condoms to delay or prevent pregnancy. Age, education, place of residence, number of living children and being counselled for family planning were identified as key factors determining contraceptive knowledge and use among married men in the study areas. To ensure increased participation of men in family planning, programmes must be designed to educate them on the need for family size limitation and involve them in service delivery, even if only to their male counterparts.

A study was conducted in Dakar, Senegal, to measure reproductive health knowledge and contraceptive use among young adults, and access to family planning services. A household survey was conducted with 1973 single and married women aged 15–24 and 936 single men aged 15–19. Two focus groups and a simulated client study were also conducted. The survey and focus groups noted gaps in knowledge of family planning methods and reproductive health. There were misconceptions about methods and only one-third of men and women aged 15–19 correctly identified the time of the menstrual cycle when a women is most likely to get pregnant. Contraceptive use at time of first premarital sexual experience was less than 30%. The simulated client study noted many barriers to services. ‘Clients’ felt uncomfortable in the clinics and felt that providers were reluctant to take care of them. None of the ‘clients’ who requested contraception received it.

The traditional proscription against sex for women during pregnancy, and particularly in the postpartum period, in south-west Nigeria leaves many men without sexual access to their wives for extended periods of time. This practice raises the question whether men abstain or seek other sexual partners. A community-based study was conducted using 3204 married men from randomly selected local government areas of the state. These men had wives who had delivered a baby in the 36 months prior to the study. Information was obtained on their sexual practices before and during pregnancy and the postpartum period. Male sexual networking was not absent outside the pregnancy and the postpartum periods. However, during pregnancy, a higher percentage of men (43·7%) had other partners compared with the period outside pregnancy and postpartum (42·1%). The difference was not significant (p>0·05). Similarly, in the postpartum abstinence period, more men (48%) had other sexual partners when compared with the period outside pregnancy and postpartum (42·1%; p<0·001). Sexual networking with non-regular and multiple partners was also more commonly observed in the postpartum period than in pregnancy (11·9% vs 10·4%; p<0·05). Significantly more rural than urban men had multiple sexual partners when their wife was pregnant (p=0·01) or in postpartum abstinence (p<0·05). Condom use with regular partners was largely absent, and consistent condom use with extramarital partners was very low among urban and rural men (6·3% vs 1·7%). The vast majority of men were having unprotected vaginal sex. Logistic regression analysis showed that polygamous men, those under 30 years in the urban area, and men with low or no education were more likely to have sex with other women when their wife was pregnant. During a wife’s postpartum abstinence period, men in higher status occupations, younger urban men (<49 years), those with more children, the polygamous, and men with a first wife under 40 years in urban area were more likely to have other partners. In light of the heterosexual mode of HIV transmission in Nigeria, there is a dire need to design and implement an intervention programme targeted at married men, which takes into consideration cultural practices. This will hopefully help check the course of the disease in a country thought to be on the verge of an HIV epidemic.

This paper examines the effect of son preference on the hazards of having a second and a third birth. With data from the Two-per-thousand National Sample Survey on Fertility and Contraception conducted in 1988 by the State Family Planning Commission of China, the hazard of having a second birth among 62+ thousand married women who have had a first birth, and the hazard of having a third birth among 43+ thousand married women who have had two births was examined. These two hazards (i.e. the hazard of moving from the first to the second birth, and the hazard of moving from the second to the third birth) were analysed by estimating Cox proportional hazard models. The major covariate in the first analysis is whether or not the first-born was a daughter. In the second analysis the main covariate is whether both of the first two children were girls. In both models seven covariates known to have independent effects on the transition to a second (or third) birth are controlled for, namely, whether the woman is a Han, whether she is a farmer, her age at the birth of the first (or second) child, whether she had her first (or second) birth prior to the initiation in 1979 of the one-child policy, and three dummy variables reflecting her level of education. The results show the important influence of son preference on the hazard of having another birth.

Data are reported on the relationship between cigarette smoking and other health-related behaviours and time to conception in a population-based sample of women who acted as a control group in a case-control study of twinning. Women who continued to smoke close to the time of conception took significantly longer to become pregnant than women who never smoked or stopped smoking before the year during which they attempted to conceive. A hierarchical regression analysis performed on time-to-conception data in women who continued to smoke in the year before conception provided weak evidence for a dose–response relationship between time to conception and number of cigarettes smoked per day. No significant relationships were found between time to conception and other health-related behaviours.

The present study involved analyses of a Caucasian American sample (n=949) and a Japanese American sample (n=400) for factors supporting Genetic Similarity Theory (GST). The analyses found no evidence for the presence of genetic similarity between spouses in either sample for the blood group analyses of nine loci. All results indicated random mating for blood group genes. The results did not provide consistent substantial support to show that spousal similarity is correlated with the degree of genetic component of a trait for a set of seventeen individual differences variables, with only the Caucasian sample yielding significant correlations for this analysis. A third analysis examining the correlation between presence of spousal genetic similarity and spousal similarity on observable traits was not performed because spousal genetic similarity was not observed in either sample. The overall implication of the study is that GST is not supported as an explanation for spousal similarity in humans.

This study examines trends in menarcheal age of women born in China between 1950 and 1973, and explores the impact of relevant social background characteristics on the timing of first menarche. Data on recalled ages of menarche collected in the 1988 Chinese Two-per-Thousand Fertility Survey are used in a linear regression model where the covariates are transformed with the help of an Alternating Conditional Expectation (ACE) algorithm. The results indicate that a trend towards early menarche has evolved in China during recent decades. The pattern of early menarche is especially pronounced among women residing in urban areas, and those who are better educated.

This paper discusses the reproductive health knowledge of Nigerian in-school adolescents, with special reference to pregnancy occurrence at first coitus. The data were derived from an Association for Reproductive and Family Health (ARFH) survey carried out in four secondary schools in Ibadan, Nigeria, between August and October 1995. A total of 828 students were interviewed. The results revealed that the majority of sexually active adolescents were not aware of the consequences of their actions. Religious affiliation and number of wives in a male adolescent’s family, and religion and marital status of a female adolescent’s parents, were found to influence adolescents’ knowledge of pregnancy probability at first coitus. This paper confirms earlier findings that the majority of Nigerian adolescents do not know the consequences of sex. Therefore, a clear-cut plan of action is needed to inform sexually active adolescents through an effective sex education programme.