study	t_thr	n1	n2	bis_grade	
Berlingeri2017	2.724	19	18	71.44	
Hu2015	1.984	56	56	67.33	
HungZhang2020	3.496	20	36	56.75
Lin2021	3.402	53	40	56.25	
McHugh2013	2.915	22	45	61.26	
MullerOehring2015	2.678	26	27	63
Posner2016	2.056	13	15	63.47





