Perinatal mortality by birth order within cohorts based on sibship size.
- 22 September 1979
- Vol. 2 (6192), 693-696
- https://doi.org/10.1136/bmj.2.6192.693
Abstract
Cross-sectional surveys of perinatal mortality show a U-shaped curve when plotted against parity, implying that fourth and subsequent babies are at increased risk. Our study of a large, population-based longitudinal data set shows that this result is an artefact and that perinatal mortality falls with increasing parity. Within cohorts of mothers based on attained sibship size the perinatal mortality decreases with increasing parity and increases with sibship size. These associations, which are not noticeably affected by maternal age, ssem in part to operate through an association between parity, sibship size, and birth weight. This analysis shows the importance of using longitudinal data in analysing such relations.This publication has 9 references indexed in Scilit:
- The artifactual nature of effects of maternal age on risk of stillbirthJournal of Biosocial Science, 1977
- COMPARISON OF LONGITUDINAL AND CROSS-SECTIONAL ANALYSIS: MATERNAL AGE AND STILLBIRTH RATIOAmerican Journal of Epidemiology, 1976
- Birth Order, Maternal Age and Birth Interval in EpidemiologyInternational Journal of Epidemiology, 1976
- The influence of the birth of a malformed child on the mother's further reproduction.Journal of Epidemiology and Community Health, 1975
- PERCENTILES OF BIRTH WEIGHTS OF SINGLE, LIVE BIRTHS AT DIFFERENT GESTATION PERIODS: Based or. 125 485 births in Norway, 1967 and 1968Acta Paediatrica, 1973
- The relationship between parental age and birth order with the percentage of low birth-weight infants.1972
- Social Correlates of Fetal MortalityThe Milbank Memorial Fund Quarterly, 1966
- Environmental versus genetic interpretations of birth‐order effectsEugenics Quarterly, 1965
- Child spacing following stillbirth and infant deathEugenics Quarterly, 1962