Open AccessShort Term Changes in Stillbirth Rates in Sweden, 1965–1971
Author(s) -
Sandahl Björn
Publication year - 1975
Publication title -
acta obstetricia et gynecologica scandinavica
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.401
H-Index - 102
eISSN - 1600-0412
pISSN - 0001-6349
DOI - 10.3109/00016347509158665
Subject(s) - medicine , parity (physics) , demography , age groups , obstetrics , physics , particle physics , sociology
. An investigation was made of short time changes in stillbirth rates in Sweden 1965–1971. The data is based on official statistics from the whole of Sweden. The material has been divided into three maternal age groups: less than 30 years, 30–34 years, and 35 years or more. Division by parity was made in five groups, parity 1, 2, 3, 4, and 5 or higher (5+). The stillbirth rates in most groups show an approximately steady level or a very slight decrease during the years under study. However, the parae 1, 2, and 5+ in the age group 35 years or over, and para 5+ in age group 30–34 years, deviate from this pattern. There is a decrease to 1969, followed by an increase. To test the apparent increase in stillbirth risk during the period 1969–1971 for high‐risk groups a X 2 ‐analysis was made. For parae 1, 4, and 5+, aged 35 years or more, a significant heterogeneity between years was found. This increase cannot be explained by a shift in age distribution within the age group ≥35 years. Exogenous factors may be involved, and further studies are planned in order to solve the problem.