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

Year Number of Results
1960 1
1961 1
1962 1
1965 39
1966 194
1967 218
1968 271
1969 290
1970 355
1971 378
1972 476
1973 569
1974 649
1975 930
1976 1244
1977 1250
1978 1470
1979 1789
1980 2072
1981 2291
1982 2554
1983 3059
1984 2878
1985 3541
1986 3904
1987 4469
1988 4548
1989 5728
1990 6953
1991 7462
1992 8064
1993 8973
1994 10753
1995 11820
1996 11554
1997 12006
1998 12843
1999 14036
2000 14232
2001 15752
2002 16604
2003 18323
2004 20570
2005 22026
2006 23553
2007 25078
2008 26392
2009 28058
2010 30255
2011 33408
2012 35826
2013 38823
2014 39077
2015 39442
2016 39273
2017 39579
2018 39706
2019 41673
2020 45277
2021 45489
2022 43535
2023 39731
2024 37870
2025 116

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848,537 results

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Page 1
A simplified guide to randomized controlled trials.
Bhide A, Shah PS, Acharya G. Bhide A, et al. Acta Obstet Gynecol Scand. 2018 Apr;97(4):380-387. doi: 10.1111/aogs.13309. Epub 2018 Feb 27. Acta Obstet Gynecol Scand. 2018. PMID: 29377058 Free article. Review.
The randomized controlled trial is the most rigorous and robust research method of determining whether a cause-effect relation exists between an intervention and an outcome. High-quality evidence can be generated by performing an randomized controll
The randomized controlled trial is the most rigorous and robust research method of determining whether a cause-effect r …
Cluster randomized controlled trials.
Puffer S, Torgerson DJ, Watson J. Puffer S, et al. J Eval Clin Pract. 2005 Oct;11(5):479-83. doi: 10.1111/j.1365-2753.2005.00568.x. J Eval Clin Pract. 2005. PMID: 16164589
Cluster randomized controlled trial (RCT), in which groups or clusters of individuals rather than individuals themselves are randomized, are increasingly common. ...
Cluster randomized controlled trial (RCT), in which groups or clusters of individuals rather than individuals themselve …
Key concepts of clinical trials: a narrative review.
Umscheid CA, Margolis DJ, Grossman CE. Umscheid CA, et al. Postgrad Med. 2011 Sep;123(5):194-204. doi: 10.3810/pgm.2011.09.2475. Postgrad Med. 2011. PMID: 21904102 Free PMC article. Review.
This narrative review is based on a course in clinical trials developed by one of the authors (DJM), and is supplemented by a PubMed search predating January 2011 using the keywords "randomized controlled trial," "patient/clinical research," "ethics," "phase …
This narrative review is based on a course in clinical trials developed by one of the authors (DJM), and is supplemented by a PubMed search …
Stepped wedge cluster randomized controlled trial designs: a review of reporting quality and design features.
Grayling MJ, Wason JM, Mander AP. Grayling MJ, et al. Trials. 2017 Jan 21;18(1):33. doi: 10.1186/s13063-017-1783-0. Trials. 2017. PMID: 28109321 Free PMC article. Review.
BACKGROUND: The stepped wedge (SW) cluster randomized controlled trial (CRCT) design is being used with increasing frequency. However, there is limited published research on the quality of reporting of SW-CRCTs. ...
BACKGROUND: The stepped wedge (SW) cluster randomized controlled trial (CRCT) design is being used with increasing freq …
Planning a cluster randomized controlled trial: methodological issues.
Christie J, O'Halloran P, Stevenson M. Christie J, et al. Nurs Res. 2009 Mar-Apr;58(2):128-34. doi: 10.1097/NNR.0b013e3181900cb5. Nurs Res. 2009. PMID: 19289934 Review.
BACKGROUND: The standard approach in a randomized controlled trial (RCT) is to randomize individuals to intervention and control groups. ...
BACKGROUND: The standard approach in a randomized controlled trial (RCT) is to randomize individuals to intervention an …
Improving the reporting of pragmatic trials: an extension of the CONSORT statement.
Zwarenstein M, Treweek S, Gagnier JJ, Altman DG, Tunis S, Haynes B, Oxman AD, Moher D; CONSORT group; Pragmatic Trials in Healthcare (Practihc) group. Zwarenstein M, et al. BMJ. 2008 Nov 11;337:a2390. doi: 10.1136/bmj.a2390. BMJ. 2008. PMID: 19001484 Free PMC article.
A pragmatic trial (a term first used in 1967 by Schwartz and Lellouch) can be broadly defined as a randomised controlled trial whose purpose is to inform decisions about practice. This extension of the CONSORT statement is intended to improve the reporting of …
A pragmatic trial (a term first used in 1967 by Schwartz and Lellouch) can be broadly defined as a randomised controlled tr
848,537 results
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