Induced abortion is closely associated with maternal morbidity, mortality, and reproductive rights of women and thus continues to draw research interest. This study assesses the reasons for abortion and their predictors using India’s National Family Health Survey-5 (2019–21) data. The sample of women aged 15–49 who had terminated their last pregnancy by induced abortion in the five years preceding the survey (n=5835) was considered for analysis. Multinomial logistic regression was used to check the adjusted effects of the socioeconomic predictors on the reasons for abortion. Stata (v16.0) was used for the data analysis. Women were more likely to abort their pregnancy at home/other than in the public health sector if unintended pregnancies (RR: 2.79; CI: 2.15–3.61) and sex-selective abortions (RR: 2.43; CI: 1.67–3.55) rather than life risk. The study found unintended pregnancy as the primary contributor to induced abortion. However, some women undergo the procedure due to medical reasons and the undesired gender of the unborn child. Unintended pregnancies that end in abortion are strongly correlated with gestational age, method of abortion, place of abortion, number of surviving children, religion, place of residence, and region. Again, there is a strong association between the sex-selective reason for abortion and the gestational age, method of abortion, place of abortion, number of surviving children, proper knowledge of the ovulatory cycle, religion, wealth quintile, and region. Women had abortions mainly due to unintended pregnancies, and there was socioeconomic, demographic, and geographic variation in the reasons for abortion in India. Sex-selective abortions continue to exist, especially among women of higher parity, poorest households and from the central, eastern, and north-eastern regions. The key to reducing unintended pregnancies and abortions is raising the understanding of contraception and empowering women in reproductive decisions. Reducing unintended pregnancies will contribute to lower induced abortion and thus improve women’s health.

In life history theory, early life adversity is associated with an accelerated reproductive tempo. In harsh and unpredictable conditions in developing societies fertility is generally higher and the reproductive tempo faster than in more secure environments. This paper examines whether differences in female anthropometry, particularly adult height, are associated with fertility intentions of women in urban environments in India. The study population consists of women aged 15–29 (N=4485) in slums and non-slums of eight Indian cities in the National Family Health Survey (NFHS) of 2005–2006. Adult height is taken as a proxy for early childhood health and nutritional condition. Fertility intentions are examined by using two variables: the desire to have a child or another child, and to have it relatively soon, as indicative of accelerated reproductive scheduling. Evidence supporting the acceleration hypothesis is found in two urban frames out of 26 examined in a two-staged multinomial logistic model. In three cases, the relationship between fertility intentions and height is the opposite than expected by the acceleration hypothesis: taller women have a higher predictive probability of desiring a(nother) child and/or narrower birth spacing. Potential explanations for the partly contradictory relationship between the childhood health indicator and fertility intentions are discussed.

Males are usually born in excess of females. The sex ratio at birth (SR) is often expressed as the ratio of male to total births. A wide variety of factors have been shown to influence SR, including terrorist attacks, which have been shown to reduce SR. This paper reviews the effects on SR outcomes of the stressful events in France in 1968 (in association with the student and worker riots) and in Japan following the Aum Shinrikyo religious cult’s attack on the Tokyo subway using sarin nerve gas in 1995. Both countries displayed seasonal variation in SR. France exhibited a decline in SR in 1968 (p=0.042), with a particularly strong dip in May of that year (p=0.015). For Japan, there was no statistically significant dip for 1995 but there was a significant dip in June of that year (p=0.026). The SR dips follow catastrophic or tragic events if these are perceived to be momentous enough by a given populace. It is believed that SR slumps may be caused by population stress, which is known to lead to the culling of frail/small male fetuses. It has been observed that these fluctuations are comparable in intensity to a substantial proportion of quoted values for perinatal mortality, potentially making this a public health issue.

Information on future intention to use contraceptives is a potential programme indicator for family planning services. Using three consecutive rounds of Ethiopian Demographic and Health Survey (EDHS) data collected in 2000, 2005 and 2011, this study examined whether the sex composition of living children and future desire for additional children were associated with the intention to use contraceptives among Ethiopian women aged 15–49 years who were not using any method of contraception at the time of the survey. The pooled multivariate binary logistic regression analysis indicated that between 2000 and 2011, the intentions of non-users to use contraceptives in the future increased significantly. Women who had at least one child (with an equal number of boys and girls, more boys than girls or more girls than boys) who did not want any more children, and those who were unsure about their desire for additional children, showed an increased intention to use contraceptives in the future, compared with those with an equal number of boys and girls who expressed a desire for additional children. Women with no children and who did not want children, or those who were unclear about their future desire, showed a lower intention to use contraceptives, compared with women with an equal number of boys and girls who wanted a child in the future.

This paper outlines the demographic characteristics of the Baiga tribe, one of the most primitive of the aboriginal tribal groups of Central India. The Baiga population has grown steadily since the first anthropological study of the tribe in the 1930s. Age at menarche, age at marriage, breast-feeding, and time interval between marriage and first conception are natural. There are more females than males. Sub-tribe endogamy is common; consanguineous marriage is favoured (34% of marriages are between first cousins) and marital distance is low (mean 7·1 km). Though the mean menarcheal age is high (15·2 years), mean age at first marriage is low (16·6 years), giving a long reproductive period.

In a recent paper in this Journal, I offered hypotheses on the offspring sex ratios of women infected with the parasite Toxoplasma gondii, and on the offspring sex ratios of people who are carriers of hepatitis B virus (HBV) (James, 2008). Subsequent research suggests that these hypotheses need amending. A detailed account of the amendments is given elsewhere in a specialized journal (James, 2010a). Here they are summarized.

The aim of this study was to identify the characteristics of individuals who formed exogamic marriages in the Friuli region (north-east Italy) during the second half of the 19th century. Logistic regression models were devised to measure the influence of the determinants of exogamic marriage, taking into account not only variables related to context but also spouses' economic, social and cultural characteristics. The determinants of exogamic marriage differ for men and women, and also vary by region due to differences in geographical mobility and size of the marriage market. The majority of exogamic spouses belong to one of two categories: either older individuals, often, especially in the case of men, with a previous marriage; or the upper social classes.

The aim of this study was to examine the effect of economic changes in the Polish territories under Austrian partition at the end of the 19th and the beginning of the 20th centuries on the trend in adult body height, and to examine the effect of number of children in a family, as a socioeconomic factor, on the differences in heights of males and females. Data collected in a 1939 survey for a group of 350 Lemkos living in Polish lands under the Austrian partition were obtained from archive material. Individual data were obtained for body height and number of siblings, to calculate family size. Linear regression analysis confirmed an increase in body height in males by about 1.2 cm per decade over the period 1860 to 1922. The number of children in a family did not appear to influence the mean body height of men and women. The observed positive mean body height trend probably resulted from the improvement in the economic conditions in the Austrian sector over the survey period.

Lateralized ultradian rhythms oscillating separately in the right and left hemispheres of the human brain can be monitored by variations in the tactile discrimination of either hand. A previous study in male German subjects has shown that the tactile error rates determined for the right and left hands oscillate with significantly different periodicities. In the present study, a group of Kenyan Maasai shepherds was tested while the subjects were leading herds on daily feeding routes. The Maasai exhibit considerable ultradian rhythms of about 2 hours in tactile error rates of either hand, but in contrast to the German subjects there is no significant difference between the right and left side. While an individual is en route, his hemispheres proceed through alternating states in matching segments of the path. Ultradian rhythms thus ‘scan’ not only the time of day but also the space, and might provide an intrinsic time-frame for neuronal processes of cognitive mapping.

Students of the problem of sex differences in intelligence will be indebted to Mackintosh and Flynn for providing useful further clarification of the issue of sex differences in intelligence. I have little to say about Flynn's paper except to note that it confirms my thesis that among adults males have a small advantage over females in abstract reasoning ability. Mackintosh and I have some common ground but there remain substantial disagreements.

Worldwide data indicate a growing number of energy homeostasis disorders, which are especially dangerous in childhood. The distribution and growing trends of overweight and obesity in children have been widely investigated, unlike the prevalence of too-low body weight and its determinants. This study aimed to estimate the frequency of body mass deficiency in Polish rural girls and differences among four Polish regions – Choszczno and Leszno in the north-west, and Ostrów Mazowiecka and Suwałki in the north-east. Data were taken from 7764 rural girls aged 9–18 years examined in 1987, when the country was in economic crisis, and 9431 such girls examined in 2001, when the country was undergoing political transformation. The frequency of weight deficiency was estimated based on BMI by applying the international standards of Cole. An Extent of Overweight (EOW) index was used to create an Extent of Thinness (EOT) index. A significant increase in weight deficiency was found in the rural girls – from 7.5% in 1987 to 8.9% in 2001 – and an increase in the EOT index from 0.37 in 1987 to 0.43 in 2001. Analysis by area of residence demonstrated significant differentiation. In the regions in north-west Poland, mainly inhabited by non-farming families, the prevalence of weight deficiency in girls almost doubled from 1987 to 2001, probably because of the mass and long-term unemployment that resulted from the closure of state farms in 1992. In contrast, in the north-east regions, the prevalence of weight deficiency remained almost unchanged over this period, with only a slight decrease, probably because the inhabitants were mainly farm and farm/working families with better living conditions. Despite the overall increase in thinness prevalence in rural girls in Poland, different living conditions have had different biological effects.

Sterilisation has been increasing in the United States in recent decades. Using the National Survey of Families and Households, this paper examines sterilisation among married couples using event history techniques, viewing husband and wife sterilisation as competing risks. Wives are more likely to experience sterilisation and at shorter durations of marriage. Number of children has a curvilinear effect on sterilisation, increasing and then decreasing its likelihood. Wives who are older than their husbands are more likely to get sterilised themselves. Black and Hispanic husbands are more likely to undergo sterilisation.

Three trends suggest that the reproductive function of the Canadian family is in transition. First, fertility has fallen and remained below the replacement level. Secondly, an increasing proportion of women are spending a larger part of their lives without having any children. Finally, an increasing proportion of women are having children without getting married.

Bilalić and McLeod’s arguments fall short on several grounds. There are excellent logical reasons to expect strong ability/chess expertise links and specific research evidence to date is sparse, with mixed findings. Data are presented from Georgia, which has a high female participation rate in chess, which suggest that differing gender motivation levels and participation rates impact relatively little on chess performance differences at the extreme.

In Matlab thana, a rural area of Bangladesh, there is a substantial deficit of males of reproductive age owing to urban migration of males who leave their families behind. These men nevertheless return to visit their families frequently. Thirty percent of the births in this area occur to families with migrant fathers: neonatal mortality rates in these families are nearly double those of families with non-migrant fathers. This high risk, in turn, interacts with educational attainment and maternal nutrition. Only those migrant families where mothers have no education or low body weight experience high neonatal mortality rates. Psychological stress during pregnancy, probably caused by fear and anxiety related to the husband's absence may in part be responsible for such differential risk of mortality during the neonatal period.

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.

Man's ability to perform his daily round of work is a complex matter and depends upon an optimal function of numerous organs and their integration. Intellectual ability, motivation and emotional stability play a great, and sometimes decisive, role in work performances.