N. Keiding

Publications432
h-index72
Citations28,669
Highly Influential Citations1,363
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MONOGRAPHS ON STATISTICS AND APPLIED PROBABILITY
Statistical Models Based on Counting Processes.
TLDR
"Statistical Models Based on Counting Processes" may be viewed as a research monograph for mathematical statisticians and biostatisticians, although almost all methods are given in sufficient detail to be used in practice by other mathematically oriented researchers studying event histories.
Multi-state models for event history analysis
An introduction to event history analysis via multi-state models is given. Examples include the two-state model for survival analysis, the competing risks and illness-death models, and models for…
Evidence for decreasing quality of semen during past 50 years.
TLDR
There has been a genuine decline in semen quality over the past 50 years, and as male fertility is to some extent correlated with sperm count the results may reflect an overall reduction in male fertility.
Male reproductive health and environmental xenoestrogens.
TLDR
The growing number of reports demonstrating that common environmental contaminants and natural factors possess estrogenic activity presents the working hypothesis that the adverse trends in male reproductive health may be, at least in part, associated with exposure to estrogenic or other hormonally active environmental chemicals during fetal and childhood development.
Thrombotic stroke and myocardial infarction with hormonal contraception.
TLDR
Although the absolute risks of thrombotic stroke and myocardial infarction associated with the use of hormonal contraception were low, the risk was increased by a factor of 0.3 with oral contraceptives that included ethinyl estradiol at a dose of 30 to 40 μg, with relatively small differences in risk according to progestin type.
Evidence for decreasing quality of semen during past 50 years.
TLDR
There has been a genuine decline in semen quality over the past 50 years and as male fertility is to some extent correlated with sperm count the results may reflect an overall reduction in male fertility.
Age‐Specific Incidence and Prevalence: A Statistical Perspective
In epidemiology incidence denotes the rate of occurrence of new cases (of disease), while prevalence is the frequency in the population (of diseased people). From a statistical point of view it is…
Neurobehavioral deficits associated with PCB in 7-year-old children prenatally exposed to seafood neurotoxicants.
Regional differences in semen quality in Europe
TLDR
Differences in semen quality may indicate different environmental exposures or lifestyle changes in the four populations, however, it remains to be seen whether such changes can account for these differences.
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