Table 2. Quality assessment of included studies based on the newcastle–ottawa scale.
Study | Selection (score) | Comparability (score) | Exposure (score) | Total scoreb | |||||
---|---|---|---|---|---|---|---|---|---|
Adequate definition of patient case | Representativeness of patients cases | Selection of controls | Definition of control | Control for important factor or additional factor | Ascertainment of exposure (blinding) | Same method of ascertainment for participants | Non-response ratea | ||
He BS [11] | 1 | 1 | 1 | 1 | 2 | 0 | 1 | 0 | 7 |
Du ML [12] | 1 | 1 | 1 | 1 | 2 | 0 | 1 | 0 | 7 |
Dikeakos P [13] | 1 | 1 | 0 | 1 | 2 | 0 | 1 | 1 | 7 |
Wei WJ [15] | 1 | 1 | 1 | 1 | 2 | 0 | 1 | 0 | 7 |
Wang R [16] | 1 | 1 | 0 | 1 | 1 | 0 | 1 | 0 | 5 |
Huang GL [18] | 1 | 1 | 1 | 1 | 2 | 0 | 1 | 0 | 7 |
Song XC [21] | 1 | 1 | 1 | 1 | 2 | 0 | 1 | 1 | 8 |
Tu HF [22] | 1 | 1 | 0 | 1 | 2 | 0 | 1 | 0 | 6 |
Zhang M [23] | 1 | 1 | 1 | 1 | 2 | 0 | 1 | 0 | 7 |
Zhang MW [24] | 1 | 1 | 1 | 1 | 2 | 0 | 1 | 0 | 7 |
Min KT [25] | 1 | 1 | 1 | 1 | 2 | 0 | 1 | 0 | 7 |
Aho DH [26] | 1 | 1 | 1 | 1 | 2 | 0 | 1 | 1 | 8 |
Kim WH [27] | 1 | 1 | 1 | 1 | 2 | 0 | 1 | 0 | 7 |
Vinci S [28] | 1 | 1 | 1 | 1 | 1 | 0 | 1 | 0 | 6 |
Vinci S [29] | 1 | 1 | 0 | 1 | 2 | 0 | 1 | 0 | 7 |
Li PY [30] | 1 | 1 | 0 | 1 | 2 | 0 | 1 | 0 | 6 |
Zhang MW [31] | 1 | 1 | 1 | 1 | 2 | 0 | 1 | 0 | 7 |
Liu ZS [32] | 1 | 1 | 1 | 1 | 2 | 0 | 1 | 1 | 8 |
Tian T [33] | 1 | 1 | 1 | 1 | 2 | 0 | 1 | 0 | 7 |
Wang ZW [34] | 1 | 1 | 1 | 1 | 1 | 0 | 1 | 0 | 6 |
Qi P [36] | 1 | 1 | 1 | 1 | 2 | 0 | 1 | 0 | 7 |
Yin ZH [37] | 1 | 1 | 0 | 1 | 2 | 0 | 1 | 0 | 6 |
Cao Y [38] | 1 | 1 | 1 | 1 | 2 | 0 | 1 | 0 | 7 |
Kupcinskas J (C) [39] | 1 | 1 | 0 | 1 | 0 | 0 | 1 | 0 | 4 |
Kupcinskas J (G) [40] | 1 | 1 | 0 | 1 | 2 | 0 | 1 | 0 | 6 |
Song B [41] | 1 | 1 | 1 | 1 | 2 | 0 | 1 | 0 | 7 |
Zhang JJ [42] | 1 | 1 | 1 | 1 | 2 | 0 | 1 | 0 | 7 |
Zhang N [43] | 1 | 1 | 1 | 1 | 2 | 0 | 1 | 0 | 7 |
Catucci I [44] | 1 | 1 | 0 | 1 | 1 | 0 | 1 | 0 | 5 |
Hezova R [45] | 1 | 1 | 1 | 1 | 1 | 0 | 1 | 0 | 6 |
Shi DN [46] | 1 | 1 | 1 | 1 | 2 | 0 | 1 | 0 | 7 |
Zhang MW [47] | 1 | 1 | 1 | 1 | 0 | 0 | 1 | 0 | 5 |
Zhou Y [49] | 1 | 1 | 0 | 1 | 1 | 0 | 1 | 0 | 5 |
Zhang P [50] | 1 | 1 | 1 | 1 | 1 | 0 | 1 | 0 | 6 |
Sun QM [51] | 1 | 1 | 0 | 1 | 2 | 0 | 1 | 0 | 6 |
Kontorovich T [52] | 1 | 1 | 1 | 1 | 0 | 0 | 1 | 0 | 5 |
Yang RX [53] | 1 | 1 | 1 | 1 | 2 | 0 | 1 | 0 | 7 |
When there was no statistical significance in the response rate between case and control groups by using a chi-squared test (P > 0.05), one point was awarded.
Total score was calculated by adding up the points awarded in each item.