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
1945 26
1946 136
1947 120
1948 108
1949 123
1950 3
1951 186
1952 416
1953 441
1954 505
1955 618
1956 730
1957 672
1958 563
1959 607
1960 713
1961 769
1962 473
1963 5
1964 39
1965 838
1966 1640
1967 2012
1968 2360
1969 2446
1970 2591
1971 2756
1972 2870
1973 3392
1974 3312
1975 3219
1976 3186
1977 3325
1978 3451
1979 3729
1980 3560
1981 4031
1982 4321
1983 4479
1984 4572
1985 4638
1986 4935
1987 4659
1988 5048
1989 5444
1990 5720
1991 6044
1992 6150
1993 6410
1994 6766
1995 6682
1996 6849
1997 7017
1998 7432
1999 7892
2000 8528
2001 9045
2002 9910
2003 10853
2004 11589
2005 12547
2006 13654
2007 14582
2008 15279
2009 15498
2010 16433
2011 17157
2012 18461
2013 19991
2014 20038
2015 20322
2016 20159
2017 20287
2018 20747
2019 20834
2020 21084
2021 19817
2022 18597
2023 16744
2024 8570

Text availability

Article attribute

Article type

Publication date

Search Results

511,439 results

Results by year

Filters applied: . Clear all
Page 1
Defining treatment-resistant depression.
Gaynes BN, Lux L, Gartlehner G, Asher G, Forman-Hoffman V, Green J, Boland E, Weber RP, Randolph C, Bann C, Coker-Schwimmer E, Viswanathan M, Lohr KN. Gaynes BN, et al. Depress Anxiety. 2020 Feb;37(2):134-145. doi: 10.1002/da.22968. Epub 2019 Oct 22. Depress Anxiety. 2020. PMID: 31638723
511,439 results
You have reached the last available page of results. Please see the User Guide for more information.