Skip to main page content
U.S. flag

An official website of the United States government

Dot gov

The .gov means it’s official.
Federal government websites often end in .gov or .mil. Before sharing sensitive information, make sure you’re on a federal government site.

Https

The site is secure.
The https:// ensures that you are connecting to the official website and that any information you provide is encrypted and transmitted securely.

Access keys NCBI Homepage MyNCBI Homepage Main Content Main Navigation

Search Page

Filters

My NCBI Filters

Results by year

Table representation of search results timeline featuring number of search results per year.

Year Number of Results
1952 3
1954 1
1955 1
1958 1
1959 1
1962 1
1964 2
1966 1
1972 1
1974 3
1975 3
1977 2
1979 1
1980 1
1982 4
1983 2
1984 3
1985 6
1986 4
1987 9
1988 1
1989 3
1990 9
1991 7
1992 3
1993 7
1994 6
1995 4
1996 6
1997 8
1998 5
1999 12
2000 7
2001 10
2002 12
2003 8
2004 14
2005 8
2006 9
2007 5
2008 6
2009 6
2010 8
2011 6
2012 9
2013 9
2014 2
2015 6
2016 7
2017 1
2018 3
2019 4
2020 1
2021 3
2022 1
2024 0

Text availability

Article attribute

Article type

Publication date

Search Results

256 results

Results by year

Filters applied: . Clear all
Page 1
The Authors Respond.
Keiding N, Ali MM, Eriksson F, Matsaseng T, Toskin I, Kiarie J. Keiding N, et al. Epidemiology. 2021 Sep 1;32(5):e17-e20. doi: 10.1097/EDE.0000000000001371. Epidemiology. 2021. PMID: 34039896 No abstract available.
Mediation proportion.
Ditlevsen S, Keiding N, Christensen U, Damsgaard MT, Lynch J. Ditlevsen S, et al. Among authors: keiding n. Epidemiology. 2005 Jul;16(4):592. doi: 10.1097/01.ede.0000165814.14012.c9. Epidemiology. 2005. PMID: 15951684 No abstract available.
Declining human fertility?
Jensen TK, Keiding N, Scheike T, Slama R, Spira A. Jensen TK, et al. Among authors: keiding n. Fertil Steril. 2000 Feb;73(2):421-3. doi: 10.1016/s0015-0282(99)00525-7. Fertil Steril. 2000. PMID: 10685558 Free article.
Falling sperm quality.
Keiding N, Giwercman A, Carlsen E, Skakkebaek NE. Keiding N, et al. BMJ. 1994 Jul 9;309(6947):131. doi: 10.1136/bmj.309.6947.131b. BMJ. 1994. PMID: 8038663 Free PMC article. No abstract available.
Analysis of time-to-pregnancy data.
Keiding N. Keiding N. Scand J Work Environ Health. 1999;25 Suppl 1:10-1. Scand J Work Environ Health. 1999. PMID: 10235398 Free article. Review.
Human fertility decline?
Joffe M, Key J, Best N, Keiding N, Jensen TK. Joffe M, et al. Among authors: keiding n. Epidemiology. 2006 Mar;17(2):238; author reply 238-9. doi: 10.1097/01.ede.0000199518.37404.6c. Epidemiology. 2006. PMID: 16477269 No abstract available.
Spermaturia and puberty.
Pedersen JL, Nysom K, Jørgensen M, Nielsen CT, Müller J, Keiding N, Skakkebaek NE. Pedersen JL, et al. Among authors: keiding n. Arch Dis Child. 1993 Sep;69(3):384-7. doi: 10.1136/adc.69.3.384. Arch Dis Child. 1993. PMID: 8215551 Free PMC article.
Multi-state models for event history analysis.
Andersen PK, Keiding N. Andersen PK, et al. Among authors: keiding n. Stat Methods Med Res. 2002 Apr;11(2):91-115. doi: 10.1191/0962280202SM276ra. Stat Methods Med Res. 2002. PMID: 12040698 Review.
Design and analysis of time-to-pregnancy.
Scheike TH, Keiding N. Scheike TH, et al. Among authors: keiding n. Stat Methods Med Res. 2006 Apr;15(2):127-40. doi: 10.1191/0962280206sm435oa. Stat Methods Med Res. 2006. PMID: 16615653 Review.
Male reproductive health and environmental xenoestrogens.
Toppari J, Larsen JC, Christiansen P, Giwercman A, Grandjean P, Guillette LJ Jr, Jégou B, Jensen TK, Jouannet P, Keiding N, Leffers H, McLachlan JA, Meyer O, Müller J, Rajpert-De Meyts E, Scheike T, Sharpe R, Sumpter J, Skakkebaek NE. Toppari J, et al. Among authors: keiding n. Environ Health Perspect. 1996 Aug;104 Suppl 4(Suppl 4):741-803. doi: 10.1289/ehp.96104s4741. Environ Health Perspect. 1996. PMID: 8880001 Free PMC article. Review.
256 results