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 Custom Filters

Results by year

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

Year Number of Results
1784 1
1787 2
1789 1
1797 4
1799 5
1801 3
1804 1
1806 2
1807 1
1810 1
1811 2
1812 2
1813 3
1814 1
1815 2
1816 4
1817 2
1819 1
1820 1
1821 1
1823 2
1824 1
1825 1
1826 5
1827 4
1828 2
1829 3
1830 1
1831 9
1832 3
1833 1
1835 2
1837 2
1838 4
1839 5
1841 4
1842 7
1843 1
1844 8
1845 4
1846 6
1848 3
1849 5
1850 10
1851 5
1852 7
1853 9
1854 8
1855 6
1856 3
1857 2
1858 3
1860 1
1861 4
1862 2
1863 1
1864 6
1866 7
1867 2
1868 3
1869 5
1870 3
1871 4
1872 9
1873 6
1874 11
1875 7
1876 3
1877 6
1878 10
1879 8
1880 3
1881 6
1882 7
1883 6
1884 6
1885 16
1886 2
1887 8
1888 5
1889 4
1890 6
1891 2
1892 1
1893 2
1894 8
1895 4
1896 7
1897 4
1898 3
1899 6
1900 4
1901 7
1902 4
1903 5
1904 2
1905 2
1906 5
1907 7
1908 9
1909 13
1910 8
1911 9
1912 8
1913 6
1914 12
1915 4
1916 8
1917 7
1918 8
1919 4
1920 11
1921 9
1922 9
1923 8
1924 14
1925 14
1926 10
1927 18
1928 16
1929 15
1930 14
1931 15
1932 11
1933 16
1934 13
1935 12
1936 9
1937 4
1938 10
1939 10
1940 10
1941 7
1942 8
1943 3
1944 10
1945 34
1946 83
1947 104
1948 112
1949 112
1950 126
1951 171
1952 204
1953 225
1954 215
1955 227
1956 262
1957 257
1958 268
1959 266
1960 245
1961 323
1962 386
1963 453
1964 540
1965 499
1966 501
1967 552
1968 627
1969 646
1970 678
1971 788
1972 832
1973 897
1974 951
1975 1929
1976 2031
1977 1956
1978 2068
1979 2130
1980 2327
1981 2250
1982 2564
1983 2939
1984 3173
1985 3279
1986 3328
1987 3458
1988 3750
1989 4550
1990 4873
1991 4908
1992 4966
1993 5314
1994 5537
1995 5723
1996 5807
1997 5923
1998 5945
1999 6050
2000 6568
2001 6975
2002 7285
2003 7414
2004 8069
2005 9263
2006 10146
2007 10890
2008 11724
2009 12298
2010 13126
2011 14119
2012 15392
2013 16272
2014 17347
2015 17801
2016 18673
2017 19845
2018 20737
2019 22596
2020 26127
2021 30170
2022 31799
2023 31363
2024 34176
2025 22151
2026 2

Publication date

Text availability

Article attribute

Article type

Additional filters

Article Language

Species

Sex

Age

Other

Search Results

501,632 results

Results by year

Filters applied: . Clear all
Page 1
Risk prediction models: II. External validation, model updating, and impact assessment.
Moons KG, Kengne AP, Grobbee DE, Royston P, Vergouwe Y, Altman DG, Woodward M. Moons KG, et al. Heart. 2012 May;98(9):691-8. doi: 10.1136/heartjnl-2011-301247. Epub 2012 Mar 7. Heart. 2012. PMID: 22397946 Review.
To these ends, developed models first and foremost need to provide accurate and (internally and externally) validated estimates of probabilities of specific health conditions or outcomes in the targeted individuals. ...In this second paper, an overview is provided of the c …
To these ends, developed models first and foremost need to provide accurate and (internally and externally) validated estimates of pr …
External cephalic version.
Coco AS, Silverman SD. Coco AS, et al. Am Fam Physician. 1998 Sep 1;58(3):731-8, 742-4. Am Fam Physician. 1998. PMID: 9750541 Free article. Review.
External cephalic version is a procedure that externally rotates the fetus from a breech presentation to a vertex presentation. External version has made a resurgence in the past 15 years because of a strong safety record and a success rate of about 65 percen
External cephalic version is a procedure that externally rotates the fetus from a breech presentation to a vertex presentation
External validation of existing dementia prediction models on observational health data.
John LH, Kors JA, Fridgeirsson EA, Reps JM, Rijnbeek PR. John LH, et al. BMC Med Res Methodol. 2022 Dec 5;22(1):311. doi: 10.1186/s12874-022-01793-5. BMC Med Res Methodol. 2022. PMID: 36471238 Free PMC article. Review.
Externally validating an existing prediction model is a difficult task, where we mostly rely on the completeness of model reporting in a published article. In this study, we aim to externally validate existing dementia prediction models. To that end, we define model
Externally validating an existing prediction model is a difficult task, where we mostly rely on the completeness of model reporting i
External Validations of Cardiovascular Clinical Prediction Models: A Large-Scale Review of the Literature.
Wessler BS, Nelson J, Park JG, McGinnes H, Gulati G, Brazil R, Van Calster B, van Klaveren D, Venema E, Steyerberg E, Paulus JK, Kent DM. Wessler BS, et al. Circ Cardiovasc Qual Outcomes. 2021 Aug;14(8):e007858. doi: 10.1161/CIRCOUTCOMES.121.007858. Epub 2021 Aug 3. Circ Cardiovasc Qual Outcomes. 2021. PMID: 34340529 Free PMC article. Review.
However, the extent to which they have been externally tested, and how well they generally perform has not been broadly evaluated. METHODS: A SCOPUS citation search was run on March 22, 2017 to identify external validations of cardiovascular CPMs in the Tufts Predic …
However, the extent to which they have been externally tested, and how well they generally perform has not been broadly evaluated. ME …
Reconceptualising the external validity of discrete choice experiments.
Lancsar E, Swait J. Lancsar E, et al. Pharmacoeconomics. 2014 Oct;32(10):951-65. doi: 10.1007/s40273-014-0181-7. Pharmacoeconomics. 2014. PMID: 24920196 Review.
While an important component, we argue that the investigation of external validity should be much broader than a comparison of final outcomes. In doing so, we introduce a new and more comprehensive conceptualisation of external validity, closely linked to process va …
While an important component, we argue that the investigation of external validity should be much broader than a comparison of final …
External validation of AI-based scoring systems in the ICU: a systematic review and meta-analysis.
Rockenschaub P, Akay EM, Carlisle BG, Hilbert A, Wendland J, Meyer-Eschenbach F, Näher AF, Frey D, Madai VI. Rockenschaub P, et al. BMC Med Inform Decis Mak. 2025 Jan 6;25(1):5. doi: 10.1186/s12911-024-02830-7. BMC Med Inform Decis Mak. 2025. PMID: 39762808 Free PMC article.
We systematically reviewed how regularly external validation of ML-based risk scores is performed and how their performance changed in external data. ...On average, AUROC was reduced by -0.037 (95% CI -0.052 to -0.027) in external data, with more than 0.05 re …
We systematically reviewed how regularly external validation of ML-based risk scores is performed and how their performance changed i …
External Field-Controlled Ablation: Magnetic Field.
Maksimovic J, Ng SH, Katkus T, Cowie BCC, Juodkazis S. Maksimovic J, et al. Nanomaterials (Basel). 2019 Nov 22;9(12):1662. doi: 10.3390/nano9121662. Nanomaterials (Basel). 2019. PMID: 31766656 Free PMC article.
Ultra-short 230 fs laser pulses of 1030 nm wavelengths were utilised in the single and multi-pulse irradiation modes. Ablation with an externally applied magnetic B-field B e x t 0.15 T was shown to strongly affect debris formation and deposition. The mechanism of surface …
Ultra-short 230 fs laser pulses of 1030 nm wavelengths were utilised in the single and multi-pulse irradiation modes. Ablation with an ex
Availability and reporting quality of external validations of machine-learning prediction models with orthopedic surgical outcomes: a systematic review.
Groot OQ, Bindels BJJ, Ogink PT, Kapoor ND, Twining PK, Collins AK, Bongers MER, Lans A, Oosterhoff JHF, Karhade AV, Verlaan JJ, Schwab JH. Groot OQ, et al. Acta Orthop. 2021 Aug;92(4):385-393. doi: 10.1080/17453674.2021.1910448. Epub 2021 Apr 18. Acta Orthop. 2021. PMID: 33870837 Free PMC article.
Background and purpose - External validation of machine learning (ML) prediction models is an essential step before clinical application. We assessed the proportion, performance, and transparent reporting of externally validated ML prediction models in orthopedic su …
Background and purpose - External validation of machine learning (ML) prediction models is an essential step before clinical applicat …
Dissociating external and internal attentional selection.
Arora K, Gayet S, Kenemans JL, Van der Stigchel S, Chota S. Arora K, et al. iScience. 2025 Mar 25;28(4):112282. doi: 10.1016/j.isci.2025.112282. eCollection 2025 Apr 18. iScience. 2025. PMID: 40248115 Free PMC article.
Thus, we asked whether internal attention-akin to external attention-modulates sensory processing. In two EEG experiments, we compared location-specific sensory enhancements during attentional selection of external (perceived) versus internal (memorized) stimuli. .. …
Thus, we asked whether internal attention-akin to external attention-modulates sensory processing. In two EEG experiments, we compare …
How to Examine External Validity Within an Experiment.
Kowalski AE. Kowalski AE. J Econ Manag Strategy. 2023 Fall;32(3):491-509. doi: 10.1111/jems.12468. Epub 2022 Jan 31. J Econ Manag Strategy. 2023. PMID: 38828383 Free PMC article.
A fundamental concern for researchers who analyze and design experiments is that the estimate obtained from the experiment might not be externally valid for other policies of interest. Researchers often attempt to assess external validity by comparing data from an e …
A fundamental concern for researchers who analyze and design experiments is that the estimate obtained from the experiment might not be e
501,632 results
You have reached the last available page of results. Please see the User Guide for more information.