Low birthweight and mortality: the tendency to repeat low birthweight and its association with early neonatal and infant morbidity and mortality.

Previous studies have demonstrated the tendency to repeat gestational age and birthweight in successive pregnancies and that this tendency is associated with infant survival. Thus, newborn outcome and survival is less favourable if the gestational age and size departs from this maternal tendency. This paper aims to study diseases or conditions that might be associated with this effect.

Low genetic effect and age-specific family effect for symptoms of anxiety and depression in nuclear families, halfsibs and twins.

Questionnaire information on symptoms of anxiety/depression was obtained from 61,286 persons, most of whom could be grouped in families as spouses, parents, offspring, siblings, halfsibs and twins. The correlations between mental health in relatives, varying somewhat by sex, were: 0.27 for 18,768 pairs of spouses, 0.

Methodological considerations in the study of frequency, risk factors and outcome of reduced fertility.

Infertility is a major health problem for many couples. Many clinicians believe that its prevalence is increasing. This may be attributable to greater concern about infertility in society and development of new treatment methods.