Aggarwal Baniyas were found to have a high prevalence of high blood pressure. Genetic and environmental influences may be implicated for this risk factor of cardiovascular disease. The aim of this study was to investigate the potential for common genetic and environmental influences on blood pressure measures (systolic and diastolic blood pressure (SBP, DBP)). The population-based sample was comprised of 309 Aggarwal Baniya families, including 1214 individuals (271 fathers, 307 mothers, 311 sons and 325 daughters) from New Delhi, India. The prevalence of obesity in this community was found to be high (BMI: fathers, 26.1 kg/m2; mothers, 29.4 kg/m2; sons, 16.9–22.4 kg/m2; and daughters, 16.3–22.7 kg/m2). Correlation and heritability were estimated. Most sibling–sibling correlations were larger than the parent–offspring correlations, and all parent–offspring and sibling–sibling correlations were larger than the corresponding spouse correlation (SBP=0.026; DBP=0.029). The maximum heritability was estimated as 44.6% for SBP and 62.8% for DBP. The lack of a significant spouse correlation is consistent with little or no influence of the common familial environment. However, the high heritability estimate for both SBP and DBPs reinforces the importance of the non-shared environmental effect.

This paper examines the association between family structure and child health in India using the third round of the National Family Health Survey, conducted during 2005–06. Two important child health indicators – underweight and full immunization – are used as dependent variables. Descriptive and multivariate statistics are deployed to establish the relationship between family structure and child health. The results of the descriptive statistics show that children who belong to a non-nuclear family have better nutritional status and higher immunization coverage than those in nuclear families. Children living with siblings have worse health status than those living without siblings for both the outcomes. Multivariate analysis shows that family structure has a small effect on the two child health outcomes, which is no longer significant after adjusting for socioeconomic measures and region. However, number of siblings is significantly and negatively associated with the nutritional status of children and full immunization coverage, even after other socio-demographic and geographic factors are controlled for. Along with family structure, parent's educational attainment, age of the mother and household economic status are significant determinants of underweight and full immunization.

The contribution of adolescents' childbearing to total fertility rates in many sub-Saharan African countries is higher than in other parts of the world. In this paper, data collected from 897 female adolescents aged 15–19 years are analysed to investigate patterns and determinants of entry into motherhood in two informal settlements in Nairobi, Kenya, using Kaplan–Meier estimates and Cox regression models. About 15% of these adolescents have had a child. The findings show that marriage, being out of school and having negative models in peer, family and school contexts are associated with early childbearing among females aged 15–17 years. For adolescents aged 18–19 years, school attendance considerably delays entry into motherhood while marriage hastens its timing. Furthermore, older adolescents with high levels of social controls (parental monitoring or perceived peer orientation to or approval of prosocial behaviours) and individual controls (high religiosity and positive orientation to schooling) are likely to delay childbearing. Programmes aiming to reduce risky sexual behaviours that could lead to childbearing among adolescents should be introduced very early, and before the onset of sexual activity. Also, the findings underscore the need to identify and address the risky factors and reinforce the protective ones in order to improve sexual and reproductive health outcomes of adolescent girls in Nairobi slum settlements.

There is now widespread agreement on the importance of men's role in reproductive decision-making. Several studies have argued that fertility preferences and their translation into behaviour differ between polygamous and monogamous unions. Studies investigating the dominance of men's preferences over women's preferences, in cases of couple disagreement, found mixed evidence of the effect of polygamy. However, an often cited limitation of these studies has been the inability to link husband's intention with each of his wives in a polygamous union. By adding fertility-intention questions to an on-going Demographic Surveillance Site in Karonga District in northern Malawi the fertility preferences and contraceptive use of husbands and wives were investigated. An analysis of the relationship between the level of agreement and disagreement between husbands' and wives' fertility preferences was then performed to gain insight into the reproductive decision-making process of polygamous couples.

Drawing upon data from the third round of the National Family Health Survey (NFHS-3) conducted in India during 2005–06, this study compares the utilization of selected maternal and child health care services between the urban poor and non-poor in India and across selected Indian states. A wealth index was created, separately for urban areas, using Principal Component Analysis to identify the urban poor. The findings suggest that the indicators of maternal and child health care are worse among the urban poor than in their non-poor counterparts. For instance, the levels of antenatal care, safe delivery and childhood vaccinations are much lower among the urban poor than non-poor, especially in socioeconomically disadvantageous states. Among all the maternal and child health care indicators, the non-poor/poor difference is most pronounced for delivery care in the country and across the states. Other than poverty status, utilization of antenatal services by mothers increases the chances of safe delivery and child immunization at both national and sub-national levels. The poverty status of the household emerged as a significant barrier to utilization of health care services in urban India.

This study tests two evolutionary hypotheses on grandparental investments differentiated by the child's sex: the paternity uncertainty hypothesis and the Trivers–Willard hypothesis. Data are from two culturally different countries: the Dutch Longitudinal Aging Study Amsterdam (n=2375) and the Chinese Anhui Survey (n=4026). In the Netherlands, grandparental investments are biased towards daughters' children, which is in accordance with the paternity uncertainty hypothesis. But in China, grandparental investments are biased towards sons' children, which is in conflict with the paternity uncertainty hypothesis. This study found no support for the Trivers–Willard hypothesis. These results raise doubts over the relevance of paternity uncertainty as an explanation of a grandparental investment bias towards daughters' children that is often found in Western populations. The results suggest that discriminative grandparental investments are better understood as the outcome of cultural prescriptions and economic motives.

This paper investigates the impact on birth intervals of three distinct birth control strategies: stopping childbearing, spacing births and the postponement of further childbearing for reasons unrelated to women's family-building histories. A macro-simulation model of the family-building process is described that incorporates heterogeneity in fecundability. This model is used to demonstrate that the postponement of further childbearing has a distinctive impact on schedules of duration-specific fertility rates that differs from that of both family-size limitation and birth spacing. In particular, the simulation results, supplemented by an analytical exposition, show that reductions in fertility due to spacing are a function of interval duration and its log, while reductions due to postponement are a function of interval duration and its square. This provides a way to test statistically for the presence of, and distinguish between, differential postponement and spacing in regression analyses of birth history data.

Although attitudes to premarital sex may be influenced by several factors, the importance of religion to that discourse cannot be underestimated. By providing standards to judge and guide behaviour, religion provides a social control function such that religious persons are expected to act in ways that conform to certain norms. This study investigated the interconnectedness of several dimensions of religion and premarital sexual attitudes among young people in the informal settlements of Nairobi, Kenya. Using reference group as the theoretical base, it was found that those affiliated with Pentecostal/Evangelical faiths had more conservative attitudes towards premarital sex than those of other Christian faiths. Additionally, while a high level of religiosity was found to associate with more conservative views on premarital sex, the effect was more pronounced among Pentecostal groups. The findings are discussed in relation to programmes on adolescent sexuality.

This paper illustrates the importance of monitoring health facility-level information to monitor changes in maternal mortality risks. The annual facility-level maternal mortality ratios (MMRs), complications to live births ratios and case fatality ratios (CFRs) were computed from data recorded during 2007 and 2009 in 31 upgraded public sector health facilities across Pakistan. The facility-level MMR declined by about 18%; both the number of Caesarean sections and the episodes of complications as a percentage of live births increased; and CFR based on Caesarean sections and episodes of complications declined by 29% and 37%, respectively. The observed increases in the proportion of women with complications among those who come to these facilities point to a reduction in the delay in reaching facilities (first and second delays; Thaddeus & Maine, 1994); the decrease in CFRs points to improvements in treating obstetric complications and a reduction in the delay in receiving treatment once at facilities (the third delay). These findings point to a decline in maternal mortality risks among communities served by these facilities. A system of woman-level data collection instituted at health facilities with comprehensive emergency obstetric care is essential to monitor changes in the effects of any reduction in the three delays and any improvement in quality of care or the effectiveness of treating pregnancy-related complications among women reaching these facilities. Such a system of information gathering at these health facilities would also help policymakers and programme mangers to measure and improve the effectiveness of safe-motherhood initiatives and to monitor progress being made toward achieving the fifth Millennium Development Goal.

As India rapidly urbanizes, within urban areas socioeconomic disparities are rising and health inequality among urban children is an emerging challenge. This paper assesses the relative contribution of socioeconomic factors to child health inequalities between the less developed Empowered Action Group (EAG) states and more developed South Indian states in urban India using data from the 2005–06 National Family Health Survey. Focusing on urban health from varying regional and developmental contexts, socioeconomic inequalities in child health are examined first using Concentration Indices (CIs) and then the contributions of socioeconomic factors to the CIs of health variables are derived. The results reveal, in order of importance, pronounced contributions of household economic status, parent's illiteracy and caste to urban child health inequalities in the South Indian states. In contrast, parent's illiteracy, poor economic status, being Muslim and child birth order 3 or more are major contributors to health inequalities among urban children in the EAG states. The results suggest the need to adopt different health policy interventions in accordance with the pattern of varying contributions of socioeconomic factors to child health inequalities between the more developed South Indian states and less developed EAG states.

Malaria is a major cause of under-five mortality in Mali and many other developing countries. Malaria control programmes rely on households to identify sick children and either care for them in the home or seek treatment at a health facility in the case of severe illness. This study examines the involvement of mothers and other household members in identifying and treating severely ill children through case studies of 25 rural Malian households. A wide range of intra-household responses to severe illness were observed among household members, both exemplifying and contravening stated social norms about household roles. Given their close contact with children, mothers were frequently the first to identify illness symptoms. However, decisions about care-seeking were often taken by fathers and senior members of the household. As stewards of the family resources, fathers usually paid for care and thus significantly determined when and where treatment was sought. Grandparents were frequently involved in diagnosing illnesses and directing care towards traditional healers or health facilities. Relationships between household members during the illness episode were found to vary from highly collaborative to highly conflictive, with critical effects on how quickly and from where treatment for sick children was sought. These findings have implications for the design and targeting of malaria and child survival programming in the greater West African region.

Normative data are reported for intelligence, height and head circumference for a sample of 1553 6- to 15-year-olds in Saudi Arabia, and for the correlations between these variables. Intelligence was tested with the Standard Progressive Matrices, on which the Saudi sample obtained a British IQ of 76.2. There were no significant differences in means between boys and girls and differences in variability were inconsistent. The heights of the Saudi sample were generally lower than those of the American norms. The differences in head circumferences between the Saudi children and the American norms were inconsistent. Correlations between IQ and height were weaker than those found in other studies but correlations between IQ and head circumference were positive.

In Ethiopia, despite some recent improvements, the health and nutritional status of children is very poor. A better understanding of the main socioeconomic determinants of child health and nutrition is essential to address the problem and make appropriate interventions. In the present study, an attempt is made to explore the effect of maternal characteristics on the health and nutritional status of under-five children using the 2005 Ethiopian Demographic and Health Survey. The health and nutritional status of children are measured using the two widely used anthropometric indicators height-for-age (HAZ) and weight-for-height (WHZ). In the ordinary least squares (OLS) estimation, it is observed that maternal characteristics have a significant impact on child health and nutritional status. The magnitudes of the coefficients, however, are found to slightly increase when maternal education is instrumented in the 2SLS estimation. Moreover, in the quantile regression (QR) estimation, the impacts of maternal characteristics are observed to vary between long-term and current child health and nutritional status.

This paper explores the hypothesis that gender attitude scales (which measure the degree of equity in gender attitudes) are associated with contraceptive use. Four hundred male and female respondents (200 couples) were interviewed using a pre-tested, structured questionnaire. Analyses included comparisons of means and prevalence rates on gender equity indicators, other related factors and socio-demographic characteristics; t-tests to compare mean scores on each gender scale for wives and husbands to identify any significant differences; chi-squared tests to compare associations between individual attributes, attitudes and contraceptive use; and multivariate logistic regression to examine associations between each gender scale and contraceptive use. The findings revealed that, on average, wives endorsed more inequitable gender attitudes compared with husbands on all gender attitude scales. For wives, more equitable gender attitudes were positively associated with contraceptive use. For husbands, the role of gender attitudes had no significant association with wives' reported contraceptive use. Family planning programmes that aim to challenge inegalitarian gender norms should not overlook women in their efforts since both men and women often accept and support inequality in a social system and, in some cases, it may be women's gender attitudes that most influence family planning decisions.

Anthropometric differences between the two Koreas are of considerable public and scientific interest given the unique socio-political status of North Korea and the fact that the nations share the same genetic ancestry. This study provides new biosocial evidence on these differences by analysing mid-upper arm circumference (MUAC) as a human welfare indicator. This is the first study to compare the nutritional status of adults surveyed inside North Korea with South Koreans. The MUAC measurements of 2793 North Korean women obtained through a household survey conducted in 2002 were compared with those of 1428 South Korean women surveyed around 2003. Comparative analysis was conducted by plotting centiles and calculating mean differences in MUAC by age. This paper finds that the MUAC of the South Koreans was on average 2.8 cm greater than that of their North Korean peers, with MUAC gaps ranging from 1.6 cm to 3.9 cm and becoming more pronounced with age. This research confirms previous studies on height and weight in the two Germanies and in the two Koreas that have shown that biosocial performance is worse in socialist economies as compared with free-market regimes.

Survey data on contraceptive use for about 80 countries are related to measures of contraceptive access, by method, from 1999 to 2009. Cross-tabulation and correlational methods are employed, with geographic comparisons and time trends. Total prevalence of use for five modern contraceptive methods correlates well to a variety of access measures. Greater access is also accompanied by a better balance among methods for both access and use. Sub-Saharan African countries show similar patterns though at lower levels. Improved access to multiple methods is consistently associated with higher levels of contraceptive use.

A total of 3961 married couples from six major geographical areas representing the South Sinai governorates in Egypt were studied to assess the rate of consanguineous marriage. The population of six selected areas (St Catherines, Nuweiba, Abu Rudeis, Ras Sudr, El Tor and Abu Zenima) were subdivided into Bedouin, urban and mixed populations. A questionnaire-based interview was conducted showing that the consanguinity rate in this region is 37.5%, with the highest rate recorded in Abu Rudeis (52.3%) and lowest rate in Nuweiba (24.1%). Consanguinity was significantly higher among the Bedouin population compared with the urban population in Abu Rudeis, Ras Sudr, El Tor and Abu Zenima, while in St Catherines and Nuweiba there was no statistically significant difference. Among consanguineous couples, 5%, 60% and 35% were double first cousins, first cousins and second cousins respectively. The mean inbreeding coefficient α of the studied population was 0.01845.

A high occurrence rate of consanguineous marriages may favour the onset and increased frequency of autosomal recessive diseases in a population. The population of Monte Santo, Bahia, Brazil, has a high frequency of rare genetic diseases such as mucopolysaccharidosis type VI, whose observed frequency in this population is 1:5000, while the incidence of this disease recorded in other regions of the world varies from 1:43,261 in Turkey to 1:1,505,160 in Switzerland. To verify the influence of consanguineous marriage on the increased frequency of observed genetic diseases in this population, the population structure and frequency of different types of marriage during different time periods were evaluated. A total of 9765 marriages were found in an analysis of parish marriage records from the city. Over three periods, 1860–1895, 1950–1961 and 1975–2010, the inbreeding rates were 37.1%, 13.2% and 4.2% respectively. Although there was a high rate of inbreeding, endogamic marriages were the dominant marriage type in all three periods. In the most recent period, there was an increase in the number of exogamous marriages and those among immigrants, but most of these occurred among individuals from cities that neighbour Monte Santo. The low rate of migration and high frequency of endogamic and consanguineous marriages show that growth of this population is predominantly internal and could explain the occurrence, and increase in frequency, of recessive genetic diseases in the city.

Studies among migrants show that they are more susceptible to HIV infection than the general population and thereby spread the epidemic from high prevalence to low prevalence areas. It is therefore critical to enhance the body of knowledge on factors associated with condom use among migrants. This study, conducted in 2009 in the State of Maharashtra, covers 4595 single in-migrants aged 15–49 years and aims at understanding the factors associated with non-use of condoms consistently. Information was collected using a Structured Interview Schedule covering demographic, socioeconomic profile, sexual history, knowledge, behaviour and stigma and discrimination indicators. Logistic regression analysis was used to understand the association between unprotected sex and various socio-demographic and environmental factors. The models were run using the Enter method. The goodness-of-fit of the model was assessed using Hosmer and Lemeshow chi-squared statistics. A significant association is observed between sex with sex workers and older migrants (>24 years), the literate, those who are mobile, unmarried, employed in the textile, quarry and construction industries, who often consume alcohol and who watch pornographic films. The factors associated with unprotected sex are age between 30 and 34 years and no literacy. Migrants who are mobile and consume alcohol show a significant association with unprotected sex. The findings suggest a need for a comprehensive HIV prevention programme including strategies to address the stressful work conditions. The prevention programmes should focus not only on skills for safer sex practices, but also on alcohol use reduction.

Adult height reflects long-term nutritional status and exposure to infectious diseases, both of which are influenced by socioeconomic factors. Very little research has been done on these inequalities from a longitudinal perspective. This paper explores the links between body height at different life stages and socioeconomic characteristics. Data were obtained from 1008 Polish schoolgirls aged 16–18 years for whom earlier data on height were available. The height of each subject was measured. Socioeconomic status and age at menarche were assessed based on information received from the surveyed girls. Girls' heights in early life were ascertained from medical records. All girls were measured by trained school nurses at 7, 9 and 14 years of age. Socioeconomic status was found to be related to body height, but not to the rate of height gain during childhood and adolescence. Girls of a higher socioeconomic status were taller than girls of a lower socioeconomic status. On dividing the research material into homogeneous groups by maturity status, the same relationship was observed. No significant relationships were found between socioeconomic status and rate of height gain between ages 7 and 16, 17, 18 years. The findings suggest that socioeconomic variation in height is the result of living conditions during the first years of life.