The low contraceptive prevalence rate and the existence of unmet demand for family planning services present a challenge for parties involved in family planning research in Tanzania. The observed situation has been explained by the demand-side variables such as socioeconomic characteristics and cultural values that maintain the demand for large families. A small, but growing body of research is examining the effect of supply-side factors such as quality of care of family planning services on the demand for contraceptives. This paper analyses the demand and supply factors determining contraceptive use in Tanzania using the Tanzania Service Availability Survey (1996) and the Tanzania Demographic and Health Survey (1996) data sets. The results show that access to family planning services and quality of care of services are important determinants of contraceptive use in Tanzania even after controlling for demand-side factors.

Data from a nationally representative study in Bangladesh (BDHS 1996–97) were analysed to identify significant predictors of use of periodic abstinence, in comparison with other modern contraceptive methods. The study found that women in Bangladesh mostly use modern methods during their peak reproductive years, after which some of them switch to periodic abstinence. These women tend to be more from educated and from higher socioeconomic backgrounds and with at least one living son. Another set of data from the Matlab DSS was analysed and the results were in the same direction. Focus group discussions found that women were using the periodic abstinence method incorrectly, abstaining for more days than is necessary. For Bangladeshi contraceptive users to reach a higher degree of use-effectiveness for period abstinence, more IEC materials need to be developed.

This paper addresses the overall performance and inequalities in the immunization of children in Vietnam. Descriptive and logistic analysis of cross-national demographic and health data was used to examine inequality in immunization, identify the most vulnerable groups in immunization coverage, and identify the gap in coverage between hard-to-access people and the remainder of the population. The gap in the coverage was found to occur primarily in vulnerable groups such as the poor minority or poor rural children. No evidence was found of a difference in immunization coverage because of sex or birth order. However, the age of children showed a significant influence on the rate of immunization. Mother’s education and regular watching of television had a significant influence on child immunization. In order to improve child immunization coverage in Vietnam, efforts should be concentrated on poor children from minority groups and those living in rural areas, especially remote ones. Community development, investment for immunization and re-organization of immunization services at the grassroots level are also key factors to remove the barriers to immunization for vulnerable populations in Vietnam.

Aiming to further explore possible underlying causes of the recent remarkable stagnation and relative decline in American heights, this paper describes the result of analysis of the commercial US Sizing Survey (2002). Heights are correlated positively with income and education among both white males and females while Body Mass Index (BMI) is correlated negatively among females, as in other samples. In contrast to much of the literature, this paper considers geographic correlates of height such as local poverty rate, median income and population density at the zip code level of resolution. After adjusting for confounding factors that influence height such as income and education, population density is found to be strongly and negatively correlated with height among white men, but less so among white women. The effect on BMIs less convincing. Other ethnic groups are not analysed in detail because of the small number of observations available. Local economic conditions as measured by median income, unemployment and poverty rate do not have a strong correlation with height or BMI after adjusting for individual income and education.

Although gains in generational intelligence test scores have been widely demonstrated around the world, researchers still do not know what has caused them. The cognitive stimulation and nutritional hypotheses summarize the several diverse potential causes that have been considered. This article analyses data for a sample of 499 children tested in 1930 and one equivalent sample of 710 children tested 72 years later, the largest gap ever considered. Both samples comprised children aged between 7 and 11 who were assessed by the Draw-a-Man test in the city of Belo Horizonte, Brazil. Further, one additional sample of 132 children was assessed in 2004 in a rural area very similar in several diverse factors to the 1930 urban sample. The results are consistent with both the cognitive stimulation and the nutritional hypotheses.

An adapted ‘sense of coherence’ scale short form (SOC-13) was administered in nine languages of Eritrea with a total of 265 participants (162 women and 103 men) in order to assess ‘resilience’ in quantitative terms. Statistical analysis yielded significant differences in SOC scores between the displaced and non-displaced: mean=54·84 (SD=6·48) in internally displaced person (IDP) camps, compared with mean=48·94 (SD=11·99) in urban and rural settlements (t=3·831, p<0·001). Post-hoc tests revealed that the main difference is between IDP camp dwellers and urban (non-displaced) residents. Those in rural but traditionally mobile (pastoralist or transhumant) communities scored more or less the same as the urban non-displaced – i.e. significantly higher than those in IDP camps (p<0·05). Analysis of variance showed that displacement has a significantly negative effect on women compared with men (RR=0·262, p<0·001). Repeating the analysis for the three groups confirmed that urban and pastoralist/transhumant groups are similar, while women in IDP camps are lower scoring (RR=0·268, p<0·001), Hamboka women being worst affected due to their experience of serial displacement. These findings are interpreted and discussed in the light of qualitative information gleaned from the study participants’ interrogation of the content of the SOC scale; and in the wider context of historical, socio-political and cultural characteristics of Eritrea. The study’s implications for humanitarian and public health policy are considered.

Skilled attendance at delivery is one of the key indicators to reflect progress toward the Millennium Development Goal of improving maternal health. This paper assesses global progress in the use of skilled attendants at delivery and identifies factors that could assist in achieving Millennium Development Goals for maternal health. National data covering a substantial proportion of all developing country births were used for the estimation of trends and key differentials in skilled assistance at delivery. Between 1990 and 2000, the percentage of births with a skilled attendant increased from 45% to 54% in developing countries, primarily as a result of an increasing use of doctors. A substantial proportion of antenatal care users do not deliver with a skilled attendant. Delivery care use among antenatal care users is highly correlated with wealth. Women aged 35 and above, who are at greatest risk of maternal death, are the least likely to receive professional delivery care. Births in mid-level facilities appear to be a strategy that has been overlooked. More effective strategies are needed to promote skilled attendance at birth during antenatal care, particularly among poor women. Specific interventions are also needed to encourage older and high parity mothers to seek professional care at delivery.

The aim of this study was to evaluate the sexual attitudes and behaviours of university students. An anonymous questionnaire was administered to 550 final-year university students aged 20–25 years in Izmir, Turkey. Male students opposed premarital sexual intercourse for both genders more than female students did. The frequency of sexual intercourse among male students (61·2%) was higher than that among female students (18·3%). The mean age of first sexual intercourse was lower among male than among female respondents. The rate of condom use at first sexual intercourse was 47·4%. The frequency of having two or more past sexual partners and masturbation was higher among males than females. It was found that there were culture-specific and gender-dependent differences in sexual attitudes and behaviours of the university students. These results may help in the planning of education and health policies in Turkey.

In fertility surveys often women (and sometimes men) are asked their fertility desires, i.e. whether they want a/nother birth or not. Some respond that they are undecided. This study examines whether these persons are more like those who say they want more births or like those who say they want no more births. Data on married men and women in 29 Demographic and Health Surveys with sample sizes ranging from 300 to 3000 are used. A logistic regression equation is estimated within each country for those with known desires and then used to classify each person who was undecided. In all sub-Saharan African countries (n=20) and for both sexes, 50% or more of the undecided persons are classified as wanting more children (with one exception of wives in Kenya). By contrast in all five Latin American countries for both sexes less than 50% of the undecided were classified in the ‘want more’ group (with an exception of husbands in the Dominican Republic). Generally, the undecided tend to be classified the same as the majority among those in the survey with stated desires.

Based on national data from civil birth registration systems, this paper provides an overview of trends in the twinning birth rates in fifteen developed countries. Patterns and differentials in such rates across populations are described, and trends over time are given. The evolution of the twinning rate in industrialized countries over the last century follows broadly the same pattern. One exception is the period around World War I, with a peak in the twinning rate being observed during the war, or just after it, although this was not registered in all countries. Since the mid-1970s twinning rates have increased in many developed countries in response to a growing use of fertility-stimulating treatments such as in vitro fertilization.

Paul Cameron, author of ‘Children of Homosexuals and Transsexuals More Apt to be Homosexual’ (Cameron, 2006) is chairman of the Family Research Institute (FRI), a conservative organization whose mandate is to preserve ‘America’s historic moral framework and the traditional family’ (http://www.familyresearchinst.org/; accessed 18th June 2006). The FRI states that research in scientific journals is needed to prove that ‘homosexuality is a public health threat and a clear and present danger to our civilization’ (http://www.familyresearchinst.org/Default.aspx?tabid = 145; accessed 18th June 2006).

Accuracy is the most important aspect of empiricism. If investigators are clear about their method and employ it to generate ‘facts,’ their opinions are irrelevant. So it is of some significance that Morrison, who spends more than one-third of his paper attacking my motives — indeed accusing me of ‘hatred of gay men and lesbian women’ — does not dispute my findings. Strip away the ad hominem attacks and little remains.