Table 1.

Newcastle–Ottawa scale and AHRQ standards assessment of studies

Newcastle–Ottawa scale and AHRQ standards assessment of studies
Studies	Newcastle–Ottawa scale			AHRQ standards
	Selection score	Comparability score	Outcome score
Olecki et al. [12]	3	0	2	Poor
Erondu et al. [13]	3	0	2	Poor
Lavryk et al. [14]	3	1	3	Good
Lee et al. [15]	3	1	2	Good
Jackson et al. [1]	3	0	3	Poor
Skowron et al. [16]	3	1	2	Good
Lepistö et al. [17]	3	0	2	Poor
Mark-Christensen et al. [8]	3	2	2	Good
Nordenvall et al. [18]	3	2	3	Good
Uchino et al. [5]	3	0	3	Poor
Helavirta et al. [19]	3	0	3	Poor
Landerholm et al. [20]	3	1	2	Good
Helavirta et al. [21]	3	0	2	Poor
Mukewar et al. [22]	3	1	3	Good
Nieminen et al. [23]	3	0	2	Poor
Keighley et al. [24]	2	0	1	Poor
Delaney et al. [25]	3	0	2	Poor
Dayton et al. [7]	3	0	2	Poor
Heushcen et al. [26]	3	0	2	Poor
Fazio et al. [27]	3	0	2	Poor
Berndtsson et al. [28]	2	0	2	Poor
Arai et al. [29]	2	0	1	Poor
Farouk et al. [30]	3	0	2	Poor
Fazio et al. [31]	3	0	2	Poor
Pemberton et al. [32]	2	0	2	Poor
MacRae et al. [33]	3	0	3	Poor