Table 2.

Summary of statistical test combinations applied in reviewed validation studies

Combination of tests ranked from most to least frequent use	Statistical test (number of combinations						Number of studies the combination (total n = 60)	References for identified studies
	Correlation coefficient	t -test/ Wilcoxon	Cross-classification	% difference	Kappa Statistic	Bland Altman
1	X	X					8	[17,22,23,25,36,51,52,55]
2	X						7	[14,16,18,29,35,37,38]
3	X		X			X	6	[32,39,42,44,47,61]
4	X	X				X	5	[21,27,28,33,62]
5	X					X	5	[19,20,34,48,53]
6	X		X				5	[15,31,38,41,45]
7	X		X		X		4	[58,59,63,64]
8	X	X	X				2	[49,65]
9	X	X	X		X	X	2	[50,54]
10	X		X	X		X	2	[46,68]
11	X				X		2	[24,26]
12	X	X			X	X	2	[43,69]
13	X	X	X			X	2	[56,60]
14	X		X	X			1	[57]
15	X				X	X	1	[30]
16	X			X	X		1	[40]
17	X		X		X	X	1	[67]
18	X	X	X		X		1	[66]
19			X		X	X	1	[92]
20				X			1	[90]
21			X				1	[91]