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What does this study test, and why?

 

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Nov 2008172413
Dec 200810124
Jan 20096166
Feb 20094175
Mar 2009555
Apr 2009241
May 2009653
Jun 2009432
Jul 2009321
Aug 2009221
Sep 2009641
Oct 2009730
Nov 2009301
Dec 2009301
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Feb 2010521
Mar 2010212
Apr 2010813
May 2010100
Jun 2010400
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Aug 2010200
Sep 2010121
Oct 2010551
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Jan 2011300
Feb 2011521
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Apr 2011431
May 2011410
Jun 2011601
Jul 2011600
Aug 2011310
Sep 2011400
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Mar 2012510
Apr 2012510
May 2012500
Jun 2012422
Jul 2012600
Aug 2012201
Sep 2012521
Oct 2012221
Mar 2013010
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Jun 2013200
Jul 2013300
Aug 2013400
Sep 2013200
Oct 2013100
Nov 2013400
Dec 2013100
Jan 2014711
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Mar 2014800
Apr 2014301
May 2014752
Jun 2014121
Jul 2014800
Aug 2014110
Sep 2014300
Oct 2014100
Dec 2014200
Jan 2015410
Feb 2015630
Mar 2015100
Apr 2015020
May 2015001
Jul 2015100
Sep 2015100
Dec 2015210
Jan 2016310
Feb 2016100
Apr 2016111
May 2016300
Jun 2016300
Jul 2016301
Aug 2016100
Sep 2016020
Nov 2016101
Dec 2016111
Jan 2017200
Feb 2017500
Mar 2017800
Apr 2017500
May 2017201
Jun 2017800
Jul 2017400
Aug 2017700
Sep 20171623
Oct 2017500
Nov 2017700
Dec 2017700
Jan 20181200
Feb 2018500
Mar 2018710
Apr 2018800
May 20182100
Jun 20181400
Jul 2018800
Aug 2018600
Sep 2018500
Oct 2018800
Nov 2018200
Dec 20181311
Jan 2019200
Feb 20191500
Mar 20197140
Apr 20192200
May 20192800
Jun 20192000
Jul 20192310
Aug 20191600
Sep 20191200
Oct 20191510
Nov 20191600
Dec 20194310
Jan 20202400
Total1017237119