This small study has looked at only one aspect of the reliability of survey data–their repeatability at an interval of 2–6 months with a different interviewer. Even for basic factual data such as date of birth, household composition and number of children there were some errors. Some were coding errors, some punching, some appeared to be reporting errors, but the numbers were small and no discernible patterns emerged.

For other factual data, such as ability to have more children or the use of different methods of contraception, the repeatability seemed to vary with the hardness of the categories. Sterilization was reported consistently, but more loosely defined characteristics, such as difficulty in conceiving or carrying a pregnancy to term, proved relatively unreliable; birth control methods which involved use of an appliance were more consistently reported than withdrawal and the safe period.

If ‘hard’ facts were reported more consistently than ‘soft’ ones it might be thought that attitudes would be reported less consistently than facts. But the dimension of hard versus soft cuts across both factual and opinion data. Fortunately for us, the question about whether they wanted more children appeared relatively hard; only 2% appeared to have changed their minds radically about this. Their memory of their intentions about becoming pregnant on the last occasion was more consistent than their reports about use of contraception around the time of conception.

The data of Pakrasi & Halder (1971) have been further analysed. No evidence was found to refute the hypothesis that there is no correlation between the sex of consecutive births except in families of four or more.

Clerical mortality rates in the United Presbyterian Church in the United States of America and the Lutheran Church-Missouri Synod have been studied in relation to selected social characteristics.

Overall mortality rates in the two study groups are more favourable than those for both the general US male population and for the total US white clergy. For most specific causes, the rates for the Lutherans but a high degree of similarity exists.

Possible explanations for these findings are discussed.

Studies of school age children who were severely malnourished in infancy have focused primarily on somatic growth and intelligence, but information about behaviour is almost completely lacking. In this study the social behaviour of 71 Jamaican school boys who were severely malnourished in infancy (index subjects) is compared with that of classmates of the same age and sex (comparisons) and also with the nearest sibling of the same sex where available. The child's behaviour in his home setting was assessed through an interview with the child's parent or parent substitute. It was found that the index children differed significantly from their comparisons in several ways. They were less liked by siblings and more unhappy at school. They more often behaved immaturely, were more clumsy and were either more highly active or lethargic. They were also more often withdrawn, solitary or unsociable. Differences between index boys and their siblings were not statistically significant on individual questions but were in the same direction as the index-comparision differences. No relationship was found between the age when admitted to hospital for malnutrition and later behaviour. Examination of the aetiological role of malnutrition and other biological and social factors is the next step in the present study.

Long-term evaluation of continuous microdosage of norgestrel suggests reappraisal of this form of oral contraception.

The data in this paper are drawn from interviews with a stratified probability sample of 2996 Yoruba men and women aged 17 or above living in Lagos and Western States in June–July 1973. Although drawing upon other material from the 1 ½-hour interviews the discussion concentrates upon the family size ideals of these individuals. In addition to the customary measures of ideal family size, new measures of the limits of acceptable family size are described, together with the reactions of the whole sample to a wide range of statements relating to family size and the value of children. It is shown that the smallest family which would be acceptable to any appreciable proportion of the population is four children, which would be acceptable to 18% of all respondents. Comparative data from elsewhere in the developing world are presented to show that African family size ideals are amongst the highest in the world. Age, educational and occupational differentials in perceptions of different family sizes are also discussed.

Verbal IQs were calculated for 60 boys who had no siblings (only boys) and 64 who were the first in a sibline (first borns) at two age levels—6 and 7 years versus 11 and 12 years. In addition to a pronounced socioeconomic status (SES) effect, three of four subgroups of only boys obtained significantly higher mean IQs than first borns. These data were interpreted as supporting the view that development of verbal abilities is facilitated by contact with parental models of language behaviour, only boys benefiting from closer contact than first borns. However, interactions among IQs, age and SES suggested that although mere increased contact is adequate to foster verbal development in younger children, quality of parental stimulation is important at higher age levels.

The vicissitudes of contraceptive efforts were studied by means of personal interviews in a sample of 100 women using the outpatient facilities of a metropolitan municipal hospital.

The women were consecutive abortion repeaters, free of any mental or emotional impairment, who made genuine efforts to practise birth control. The circumstances of their failure to prevent recurrent unwanted pregnancies were analysed, and led to these conclusions.

1. The average number of birth control methods used by the subjects was 1.9, which figure does not include a resumption of a method once replaced.

2. The role of motivation is but one, and not necessarily the most essential, element in successful contraceptive practice.

3. The interplay between contraceptive technology and various elements of human behaviour puts a limit on the effectiveness of any current contraceptive method; it products a significant and irreducible number of contraceptive failures that are relatively independent of any subjective motivation.

4. As a result of such interplay, many women would temporarily suspend contraceptive practice; the subsequent activation of psychological mechanisms then makes them ignore the risk of preganancy.

The Shetland Islands lie in the North Atlantic approximately equi-distant between Scotland, Norway and the Faroes. The earliest known colonizers came from the Mediterranean, but when the Vikings arrived (c. AD 800), there seem to have few or no human inhabitants. The descendants of the west Scandinavians who came to the islands in the early Viking movement still comprise the bulk of the human population, and form a series of isolates unique in the United Kingdom.

The paper summarizes the available information on the origins and physical characteristics of the Shetlanders. Much of this is trivial, but in the absence of any other review we have brought together what is known. The only blood group data are ABO frequencies which are similar to those on the other North Atlantic islands (Orkney, Faroe and Iceland). The best estimates of relationship are based on comparisons of non-metrical skull variant frequencies which show that the nearest relatives of the Shetlanders are the inhabitants of Jaeren in southern Norway. The same conclusion comes from independent evidence of linguistic affinities.

Shetland has the highest known prevalence of multiple sclerosis in the world, and possibly a high incidence of gastric ulceration. It also has a large number of standard Down's syndrome (trisomy-21) patients. These could be the result of the fathers' periodic absences at sea, resulting in their families being spread over a large span of years. Clearly there are interesting and possibly important morbidity and mortality factors operating in the population—which could give significant information about genetical factors in disease. Data on mental defect and psychiatric disease are also presented.

An analysis of Maori fertility shows that a transition from a high to a low level has begun. The crude birth rate has declined by nearly 28% during the period 1961–72; only a small part of this decline can be attributed to changes in the age–sex and marital status composition.

A substantial decline in the fertility of older women has been observed and there are indications of the beginning of a major decline in the fertility of younger women. Since women aged 30–49 still account for 30% of total fertility there is enough potential for a further fertility decline in the later child-bearing years.

Age patterns of fertility decline suggest that inter-marriage between Pakehas and Maoris is not a prime cause of the recent fertility decline. The factors which are thought to be responsible for this change in Maori fertility are rapid urbanization, a low level of infant mortality and an increase in the overall level of education.

A further decline in Maori fertility will depend on the continuation of the tendency in fertility among the younger women.