Abstract
| Originalsprog | Engelsk |
|---|---|
| Tidsskrift | Epidemiology |
| Vol/bind | 19 |
| Udgave nummer | 2 |
| Sider (fra-til) | 191-6 |
| Antal sider | 5 |
| ISSN | 1044-3983 |
| DOI | |
| Status | Udgivet - 2008 |
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I: Epidemiology, Bind 19, Nr. 2, 2008, s. 191-6.
Publikation: Bidrag til tidsskrift › Tidsskriftartikel › Forskning › peer review
}
TY - JOUR
T1 - Time trends in human fecundability in Sweden.
AU - Scheike, Thomas H
AU - Rylander, Lars
AU - Carstensen, Lisbeth
AU - Keiding, Niels
AU - Jensen, Tina Kold
AU - Stromberg, Ulf
AU - Joffe, Michael
AU - Akre, Olof
PY - 2008
Y1 - 2008
N2 - BACKGROUND: Trends in biologic fertility are elusive. Possible negative trends in male reproductive health are still debated, and their effect on human fertility might be negligible. Time-to-pregnancy (TTP) is a functional measure of couple fecundability. METHODS: We analyzed data on TTP among 832,000 primiparous women 20 years of age and older in the nationwide Swedish Medical Birth Registry from 1983 through 2002. This age restriction led to an exclusion of 10% of primiparous pregnancies. Subfertility (TTP > or =1 year) was analyzed as a function of maternal age, calendar time at initiation of attempt, and birth cohort-taking into account the truncation problems that are inherent in birth-based retrospective sampling. RESULTS: Subfertility generally decreased over successive birth cohorts. When studied as a period effect, a transient increase in subfertility was seen in the early 1990s. Subfertility increased with age, except that for women in their late 1930s, an apparent decrease was observed, particularly among the early cohorts. CONCLUSION: We found decreasing subfertility over time. We speculate that these patterns might be related to a Sweden-specific decrease over time in sexually transmitted diseases, to changes in sexual behavior induced by socioeconomic conditions, or to broader biologic or educational trends.
AB - BACKGROUND: Trends in biologic fertility are elusive. Possible negative trends in male reproductive health are still debated, and their effect on human fertility might be negligible. Time-to-pregnancy (TTP) is a functional measure of couple fecundability. METHODS: We analyzed data on TTP among 832,000 primiparous women 20 years of age and older in the nationwide Swedish Medical Birth Registry from 1983 through 2002. This age restriction led to an exclusion of 10% of primiparous pregnancies. Subfertility (TTP > or =1 year) was analyzed as a function of maternal age, calendar time at initiation of attempt, and birth cohort-taking into account the truncation problems that are inherent in birth-based retrospective sampling. RESULTS: Subfertility generally decreased over successive birth cohorts. When studied as a period effect, a transient increase in subfertility was seen in the early 1990s. Subfertility increased with age, except that for women in their late 1930s, an apparent decrease was observed, particularly among the early cohorts. CONCLUSION: We found decreasing subfertility over time. We speculate that these patterns might be related to a Sweden-specific decrease over time in sexually transmitted diseases, to changes in sexual behavior induced by socioeconomic conditions, or to broader biologic or educational trends.
U2 - 10.1097/EDE.0b013e31816334ad
DO - 10.1097/EDE.0b013e31816334ad
M3 - Journal article
C2 - 18223482
SN - 1044-3983
VL - 19
SP - 191
EP - 196
JO - Epidemiology
JF - Epidemiology
IS - 2
ER -