Intended for healthcare professionals

Endgames Statistical Question

External and internal validity in clinical trials

BMJ 2012; 344 doi: https://doi.org/10.1136/bmj.e1004 (Published 16 February 2012) Cite this as: BMJ 2012;344:e1004

Article usage

Article metrics provide readers and authors with an indication of how often a specific article has been accessed month by month. It counts three formats - abstract/extract, full text and pdf. The page is updated each day.

Usage statistics: February 2012 to October 2019

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AbstractFullPdf
Feb 20121992748317
Mar 20122218434
Apr 20121556137
May 2012825731
Jun 2012516519
Jul 2012414216
Aug 2012584520
Sep 2012822411
Oct 2012597627
Nov 2012553911
Dec 2012364411
Jan 201337216
Feb 201328268
Mar 201349359
Apr 201342274
May 2013575516
Jun 2013365115
Jul 2013344113
Aug 2013453716
Sep 2013713814
Oct 2013594614
Nov 20131014818
Dec 2013705219
Jan 2014443615
Feb 2014593415
Mar 2014804214
Apr 2014545914
May 201456389
Jun 201432505
Jul 201417231
Aug 2014331416
Sep 2014262213
Oct 2014261210
Nov 201429129
Dec 201442256
Jan 201544166
Feb 2015452911
Mar 2015864015
Apr 2015996130
May 2015826214
Jun 201540259
Jul 201532106
Aug 2015552114
Sep 2015716130
Oct 201579457
Nov 2015945018
Dec 2015764715
Jan 20161085010
Feb 201669438
Mar 20161693510
Apr 20161325626
May 20161220328186
Jun 2016957266132
Jul 201683153
Aug 20161012310
Sep 20161144420
Oct 20161204115
Nov 20161032810
Dec 2016117527
Jan 201793498
Feb 2017123549
Mar 20171699849
Apr 20171261507377
May 20171434517
Jun 201793287
Jul 201787228
Aug 2017138319
Sep 20172496537
Oct 20172094511
Nov 2017160334
Dec 20171494811
Jan 2018136549
Feb 20181814617
Mar 201826010553
Apr 20181497500272
May 20182619327
Jun 20181864111
Jul 2018172388
Aug 2018176469
Sep 20184978240
Oct 20182438715
Nov 20182416410
Dec 20181945010
Jan 20192457017
Feb 20192066617
Mar 20191358268196
Apr 201985218887
May 20192477915
Jun 2019171445
Jul 2019110264
Aug 201974237
Sep 2019149277
Oct 201974205
Total1844366682843