1.
纳入研究的一般情况和质量评价
The characteristics of included studies and quality assessment
| Author | Year | No. of cases | No. of controls | NOS score | Level | |||
| Selection | Comparability | Exposure | Summary | |||||
| Nakachi[12] | 1993 | 85 | 170 | 3 | 2 | 1 | 6 | A |
| Qu[11] | 1998 | 180 | 179 | 3 | 1 | 1 | 5 | B |
| Persson[13] | 1999 | 75 | 119 | 3 | 2 | 1 | 6 | A |
| Hayashi [15] | 2000 | 156 | 148 | 3 | 2 | 1 | 6 | A |
| Xue[14] | 2001 | 106 | 106 | 4 | 2 | 1 | 7 | A |
| Zhang[17] | 2002 | 65 | 60 | 3 | 2 | 1 | 6 | A |
| Quinones[16] | 2004 | 197 | 144 | 3 | 2 | 1 | 6 | A |
| Nimura[18] | 1997 | 91 | 137 | 3 | 2 | 1 | 6 | A |
| Gu[21] | 2004 | 180 | 224 | 3 | 2 | 2 | 7 | A |
| Li[23] | 2006 | 98 | 136 | 4 | 2 | 1 | 7 | A |
| Hong[24] | 1998 | 72 | 63 | 3 | 0 | 1 | 4 | B |
| Jin[25] | 2010 | 150 | 150 | 3 | 2 | 1 | 6 | A |
| Zhu[27] | 2010 | 160 | 160 | 4 | 2 | 2 | 8 | A |
| Xia[28] | 2008 | 58 | 116 | 3 | 2 | 2 | 7 | A |
| Wang[26] | 2006 | 91 | 86 | 3 | 2 | 2 | 7 | A |