Table 6: Methodological evaluation of the selected studies according to the Methodological Index for Non-Randomized Studies (MINORS). Scores were assigned as follows: 0 (not reported); 1 (reported but inadequate); and 2 (reported and adequate). The ideal global score is 16 for noncomparative studies and 24 for comparative studies [11].

CriteriaCunningham et al. [16]Forssell et al. [17]Bertolini et al. [18]Busby et al. [19]Lee et al. [9]Al-Ahmad et al. [20]Choi et al. [3]Silva et al. [21]Rustemeyer et al. [22]Khadka et al. [23]Murphy et al. [4]Khattak et al. [24]Rustemeyer and Gregersen [25]Trovik et al. [26]Rustemeyer and Lehmann, [27]

A clearly stated aim222222222222222
Inclusion of consecutive patients122221211221210
Prospective collection of data022020222220200
Endpoints appropriate for the study aim111122212222222
Unbiased evaluation of endpoints000000000010000
Appropriate follow-up222222212211222
Loss to follow-up of less than 5%020020000000000
Prospective sample size calculation000000000000000
Adequate control groupNANANANANA2NANANA1NANANANA2
Contemporary groupsNANANANANA0NANANA2NANANANA2
Baseline equivalence of groupsNANANANANA2NANANA2NANANANA2
Adequate statistical analysesNANANANANA2NANANA2NANANANA2
Total score61197121310791710610714

CriteriaWee and Pon [28]Göelzer et al. [5]Schwitzer et al. [29]Abdullah [31]Corso et al. [30]Park et al. [32]Baherimoghaddam et al. [33]Kilinc and Ertas [34]Kurabe et al. [36]Silva et al. [35]Bogusiak et al. [37]Huang et al. [38]Alanko et al. [2]Pelo et al. [39]Zingler et al. [40]

A clearly stated aim222222222222222
Inclusion of consecutive patients121111222222112
Prospective collection of data022022222202222
Endpoints appropriate for the study aim22222222211222
Unbiased evaluation of endpoints000000000000000
Appropriate follow-up221212222212122
Loss to follow-up of less than 5%000000000200000
Prospective sample size calculation000000000000000
Adequate control groupNANANANA0222NANANA002NA
Contemporary groupsNANANANA1222NANANA212NA
Baseline equivalence of groupsNANANANA2222NANANA222NA
Adequate statistical analysesNANANANA2222NANANA222NA
Total score71067131818181012615131810