A study difficulty inventory and three sets of personality scales were administered to 145 students attending a university health centre. Motivational and psychoneurotic components of study difficulty were identified, which were differentially related in male and female students to basic personality characteristics and to psychiatric symptomatology. Syllabus-boundness emerged as more salient in the female students, and self-esteem in the males. Poor academic performance was found to be associated with distinctive personality profiles in the two sexes. Both intra-personality and social–psychological interactional factors appear to underlie the pattern of results.

A discrete time probability model has been developed to describe the waiting time until the first conception for a woman who is married before the age of 20 years. The model is illustrated by applying it to data on the time of first conception on the basis of the moment estimates of the parameters.

In a previous pilot project (Rosenzweig & Adelman, 1976) the sex choice attitudes of married couples with university (graduate school) education were explored. The present study extends this work by investigating the sex-choice attitudes of high school and partially college-educated subjects. Once again, the basic decision-making unit of husband and wife was sampled. Differences in sex preferences and sex-choice attitudes, based on the size of the marital family (no child, one child), were systematically explored. A greater effort was made to determine the effect of additional information regarding new methods of fetal sex determination, contraception, and related topics on sex-choice attitudes. Questionnaires were completed before and after information had been provided. Discussion was encouraged between husband and wife but discouraged with others. Results indicated that the exercise of sex choice is favoured by the majority of subjects across all three educational groups. Most individuals would employ sex control to ensure a balance of the sexes in a limited, two-child family. Little desire was shown to choose first child sex but active choice of a second child of opposite sex from the first appears a strong probability. Male preference, while pronounced, was a much weaker influence on the desire to make choices than the balance principle. Selective intercourse and a sex-choice pill were acceptable methods of sex control, but both artificial insemination and fetal sex determination combined with selective early abortion were rejected. Added information had a measurable but only slight effect on attitudes. Public education as to the possibilities of sex choice and control will be gradual and sex control will probably be selectively employed in the near future. But general use of such procedures is not imminent. Once put into practice, however, sex choice will create new marital problems that may require professional counselling.

A review of empirical findings which differentiated between the effects of social and non-social variables in the determination of human conduct found non-social variables most frequently to have been superior. A two-factor comparision of the impact of money and social cues, discriminative stimuli, and rewards from delinquent peers on incarcerated juvenile delinquents found money to be the more powerful determinant of cheating behaviour (P < 0.001). It is suggested that explanations of human behaviour should not ignore the effects of non-social variables.

The influence of parental age at birth, and parity, was studied in a series of 48 dyslexic boys. It was concluded that both increased paternal and maternal age contributes to a greater incidence of the condition. The similarity to the age distributions of chromosomal aberrations and some mutation defects suggests some genetic implication. The findings thus favour a biological rather than environmental element in the aetiology.

This study examines the relationship between verbal, performance and total IQ scores and social class of 193 male householders living in a Cambridge suburb. The correlation coefficients between IQ scores and present occupational status were significantly higher than the correlations between IQ scores and social class of origin, suggesting that intragenerational social mobility is positively related to IQ.

Parent–offspring data were available for 85 father–son pairs. Analysis of the IQ differences between fathers and sons in relation to their social class differences provided further evidence for selective migration related to both IQ components and total IQ scores. In this sample there was a simple relationship between the extent of social mobility and the degree of difference between the father's and son's IQ scores.

At the end of the 4th week of the Hilary Term 1977, 1006 male and 1009 female undergraduates at Oxford University were sent a questionnaire enquiring about their sexual behaviour and contraceptive practice. Of the 862 women and 634 men who replied, 512 women (59%) and 332 men (52%) had experienced sexual intercourse, 396 women and 191 men in the 4-week period preceding receipt of the questionnaire. No contraception had been used by 27% of the women on the first occasion that they had had intercourse; during the 4-week period preceding receipt of the questionnaire 10% of sexually active women had had intercourse on one or more occasions without using a contraceptive. The use of contraception increased with the frequency of intercourse and the stability of the relationship. Thirty-one women had been pregnant in the past; none was known to be pregnant at the time of the survey, although sixteen suspected that they might be. Ninety per cent of the students approved of the free distribution of a booklet on contraception and related matters to all undergraduates.

This paper reports the diffusion of knowledge of screening for a genetic disorder (Tay–Sachs disease) in two fairly well defined, urban, Jewish populations in the Baltimore and Washington metropolitan areas, and on some of the sociological variables which influence the diffusion. Differences between the two populations are shown.