Intended for healthcare professionals

Letters

Matching in case-control studies

BMJ 1995; 310 doi: https://doi.org/10.1136/bmj.310.6975.329d (Published 04 February 1995) Cite this as: BMJ 1995;310:329

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: July 2003 to June 2022

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AbstractFullPdf
Jul 20030270
Aug 20030270
Sep 20030370
Oct 20030260
Nov 20030360
Dec 20030260
Jan 20040240
Feb 20040300
Mar 20040230
Apr 20040340
May 20040510
Jun 20040360
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Aug 20040350
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Oct 20040360
Nov 20043480
Dec 200422590
Jan 20055480
Feb 20050550
Mar 20056510
Apr 20051270
May 20050320
Jun 20052500
Jul 20055520
Aug 20053190
Sep 20053290
Oct 20057510
Nov 20054440
Dec 20053530
Jan 20063320
Feb 20068790
Mar 20066890
Apr 20061510
May 20064530
Jun 20063560
Jul 20061520
Aug 20064480
Sep 20064750
Oct 20065750
Nov 2006121200
Dec 20067620
Jan 20071730
Feb 20077760
Mar 200721050
Apr 200731130
May 200731000
Jun 20072830
Jul 20071760
Aug 20078890
Sep 20074740
Oct 200741090
Nov 200751610
Dec 200751280
Jan 200871440
Feb 200821410
Mar 200821330
Apr 200872080
May 200821670
Jun 200861110
Jul 200821000
Aug 200831000
Sep 200851180
Oct 200821330
Nov 200861540
Dec 200831090
Jan 200955600
Feb 200965630
Mar 200956930
Apr 200999710
May 200954780
Jun 200949590
Jul 200942680
Aug 200948640
Sep 200959410
Oct 200971840
Nov 2009107870
Dec 200954660
Jan 201074840
Feb 201065750
Mar 2010921040
Apr 201083780
May 201087970
Jun 201092850
Jul 201054760
Aug 201049600
Sep 20101031050
Oct 2010122930
Nov 2010132770
Dec 2010101620
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Feb 201185510
Mar 2011137800
Apr 201185590
May 201152550
Jun 201151190
Jul 201129270
Aug 20118730
Sep 20117730
Oct 201171120
Nov 20111440
Dec 20110150
Jan 201220140
Feb 201225120
Mar 201213100
Apr 20121790
May 20126130
Jun 2012440
Jul 2012430
Aug 2012220
Sep 2012510
Oct 20121850
Nov 201235210
Dec 20121460
Jan 2013490
Feb 20133100
Mar 20131270
Apr 2013590
May 2013780
Jun 20131840
Jul 2013370
Aug 2013420
Sep 2013760
Oct 2013790
Nov 201326110
Dec 2013950
Jan 2014730
Feb 2014890
Mar 2014380
Apr 20141180
May 20141130
Jun 2014430
Jul 2014060
Aug 2014030
Sep 2014020
Nov 20141530
Dec 2014100
Jan 2015440
Feb 2015010
Mar 2015410
Apr 2015300
May 20151210
Jun 2015900
Jul 20151230
Aug 2015500
Sep 2015220
Oct 2015620
Nov 2015400
Dec 2015460
Jan 2016310
Feb 2016510
Mar 20161180
Apr 2016910
May 20161330
Jun 2016720
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Aug 2016400
Sep 2016610
Oct 2016900
Nov 20168100
Dec 2016210
Jan 2017920
Feb 20171110
Mar 20171050
Apr 2017750
May 20172420
Jun 20178110
Jul 20171630
Aug 2017600
Sep 2017830
Oct 20171210
Nov 2017720
Dec 20171510
Jan 20181010
Feb 20181320
Mar 2018310
Apr 20181550
May 20181930
Jun 20182410
Jul 20186150
Aug 20181970
Sep 20182370
Oct 20183980
Nov 20184270
Dec 20182420
Jan 20192360
Feb 201923150
Mar 201934130
Apr 20191980
May 201951110
Jun 20193790
Jul 201950100
Aug 20195260
Sep 201953130
Oct 201942110
Nov 201952150
Dec 201945110
Jan 202066140
Feb 202042160
Mar 202032100
Apr 202011390
May 202081120
Jun 202074130
Jul 20204740
Aug 20207250
Sep 202077150
Oct 2020170130
Nov 2020174140
Dec 2020161180
Jan 2021176230
Feb 2021219120
Mar 2021239190
Apr 2021213100
May 2021222120
Jun 2021168150
Jul 202113190
Aug 2021117150
Sep 2021206110
Oct 2021137200
Nov 2021238170
Dec 2021155110
Jan 2022162260
Feb 2022241300
Mar 2022261230
Apr 2022267300
May 2022295390
Jun 202296260
Total854882600