Table 2 Newcastle–Ottawa Quality Assessment Scale (NOS) scoring records of the included studies
First Author[Year] | Selection | Comparability | Exposure | Total score | ||
|---|---|---|---|---|---|---|
Assessment of outcome | Follow-up long enough for outcome | Adequacy of follow-up of cohorts | ||||
Chen F [20] | 4 | 2 | 1 | 1 | 1 | 9 |
Liang J [21] | 4 | 2 | 1 | 1 | 1 | 9 |
Feng JF [22] | 4 | 2 | 1 | 1 | 1 | 9 |
Sen F [23] | 4 | 2 | 1 | 1 | 1 | 9 |
Senan S [24] | 4 | 2 | 1 | 1 | 0 | 8 |
Zhao Q [25] | 4 | 2 | 1 | 1 | 1 | 9 |
Yao L [26] | 4 | 2 | 1 | 1 | 0 | 8 |
Liew MS [27] | 4 | 2 | 1 | 1 | 1 | 9 |
Sugawara S [28] | 4 | 2 | 1 | 1 | 1 | 9 |
Atagi S [29] | 4 | 2 | 1 | 1 | 1 | 9 |
Wang LH [30] | 4 | 2 | 1 | 1 | 0 | 8 |
John H [31] | 4 | 2 | 1 | 0 | 0 | 7 |
Segawa Y [32] | 4 | 2 | 1 | 1 | 1 | 9 |
Yamamoto N [33] | 4 | 2 | 1 | 1 | 1 | 9 |
Atagi S [34] | 4 | 2 | 1 | 0 | 0 | 7 |
Cakir S [35] | 4 | 2 | 1 | 1 | 1 | 9 |
Sarihan S [36] | 4 | 2 | 1 | 0 | 0 | 7 |
Komaki R [37] | 4 | 2 | 1 | 0 | 0 | 7 |
Ball D [38] | 4 | 2 | 1 | 1 | 1 | 9 |
Ball D [39] | 4 | 2 | 1 | 1 | 1 | 9 |
Jeremic B [40] | 4 | 2 | 1 | 1 | 1 | 9 |
Trovo MG [41] | 4 | 2 | 1 | 0 | 0 | 7 |