Intended for healthcare professionals

Research Methods & Reporting Statistics Notes

Brackets (parentheses) in formulas

BMJ 2011; 343 doi: https://doi.org/10.1136/bmj.d570 (Published 11 August 2011) Cite this as: BMJ 2011;343:d570

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: August 2011 to November 2019

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AbstractFullPdf
Aug 20112256865309
Sep 2011447231186
Oct 20119580105
Nov 20112007436
Dec 20113906024
Jan 20123055923
Feb 2012584924
Mar 2012917836
Apr 2012564321
May 2012454114
Jun 2012544516
Jul 2012377627
Aug 2012366828
Sep 2012445517
Oct 2012826421
Nov 2012575216
Dec 2012342811
Jan 201351328
Feb 2013272810
Mar 201332185
Apr 201324419
May 2013405319
Jun 2013503114
Jul 2013385118
Aug 201308016
Sep 20132607
Oct 201309834
Nov 201309233
Dec 201305712
Jan 201406012
Feb 201407519
Mar 201408027
Apr 2014010730
May 20140619
Jun 2014014921
Jul 2014011427
Aug 201407722
Sep 201409219
Oct 201403511
Nov 201408425
Dec 201407525
Jan 201506825
Feb 2015010451
Mar 201509240
Apr 201505937
May 201507044
Jun 201506531
Jul 2015112727
Aug 201506831
Sep 201507831
Oct 201507415
Nov 2015011318
Dec 2015012024
Jan 201607614
Feb 201609522
Mar 201619414
Apr 201616918
May 201607515
Jun 201609121
Jul 201619015
Aug 201607730
Sep 201626229
Oct 201619715
Nov 201616120
Dec 201607919
Jan 201709325
Feb 2017115329
Mar 2017018119
Apr 201718922
May 201709825
Jun 2017010416
Jul 2017011813
Aug 2017012219
Sep 2017010010
Oct 2017012224
Nov 201708113
Dec 20170519
Jan 201808924
Feb 201817413
Mar 201818613
Apr 2018010217
May 201801029
Jun 201809432
Jul 201815613
Aug 201808012
Sep 20180509
Oct 20180509
Nov 20181718
Dec 201828415
Jan 201939318
Feb 201917522
Mar 201905622
Apr 201906428
May 201924618
Jun 20191457
Jul 201903416
Aug 201915415
Sep 20193338
Oct 201913820
Nov 20191135
Total458084232529