Table 1.
Characteristics of included studies
| First author, Year | Region | Type of study | Exposure | Quantity | Number of cases | Number of controls | NOS |
|---|---|---|---|---|---|---|---|
| Rong SY 2008 [26] | Hebei | Case-control study | Soy foods | ≥3 times/month vs. ≤1 times/month | 175 | 175 | 6 |
| Vegetables | ≥3 times/week vs. ≤1 times/week | ||||||
| Fruits | ≥3 times/week vs. ≤1 times/week | ||||||
| Xu GF 1998 [27] | Shangdong | Case-control study | Soy foods | >100 g/d vs. <10 g/d | 186 | 186 | 7 |
| Vegetables | >400 g/d vs. <50 g/d | ||||||
| Fat | >100 g/d vs. <50 g/d | ||||||
| Tao MH 2001 [28] | Shanghai | Case-control study | Soy foods | >3631.75 g/year vs. ≤1182.6 g/year | 356 | 925 | 5 |
| Vegetables | >9000 g/month vs. ≤6000 g/month | ||||||
| Fruits | >5250 g/month vs. ≤1040 g/month | ||||||
| Ren XN 2008 [29] | Liaoning | Case-control study | Soy foods | >3 times/week vs. <2 times/week | 200 | 200 | 5 |
| Vegetables | >14 times/week vs. ≤7 times/week | ||||||
| Fruits | ≥14 times/week vs. <7 times/week | ||||||
| Wang YQ 2006 [30] | Zhejiang | Cohort study | Soy foods | >4.8 kg/year vs. ≤0.799 kg/year | 84 | 269 | 9 |
| Vegetables | 36 kg/year vs. ≤7.2 kg/year | ||||||
| Zhao YB 1999 [31] | Sichuang | Case-control study | Soy foods | Occasional vs. regular | 265 | 265 | 5 |
| Vegetables | >250 g/day vs. <250 g/day | ||||||
| Fat | More vs. less | ||||||
| Fruits | Occasional vs. regular | ||||||
| Zou L 2003 [32] | Hubei | Case-control study | Soy foods | Occasional vs. regular | 112 | 112 | 5 |
| Vegetables | >250 g/day vs. <250 g/day | ||||||
| Fat | More vs. less | ||||||
| Fruits | Occasional vs. regular | ||||||
| Zhou L 2009 [33] | Jiangsu | Case-control study | Soy foods | >6500 g/year vs. ≤2500 g/year | 206 | 214 | 5 |
| Fruits | >54750 g/year vs 36500 g/year | ||||||
| Wang LY 2008 [34] | Beijing | Case-control study | Soy foods | >3 times/week vs. 0 | 429 | 781 | 4 |
| Cai SR 1996 [35] | Ningxia | Case-control study | Soy foods | Occasional vs. regular | 100 | 100 | 6 |
| Yuan JM 1987 [36] | Shanghai | Case-control study | Fat | >72.5 g/day vs. <38 g/day | 534 | 534 | 6 |
| Fu XJ2012 [37] | Guangdong | Case-control study | Vegetables | Occasional vs. regular | 419 | 372 | 7 |
| Fruits | Occasional vs. regular | ||||||
| Zhang JC 2003 [38] | Henan | Case-control study | Soy foods | Occasional vs. regular | 300 | 300 | 6 |
| Vegetables | >250 g/day vs. <250 g/day | ||||||
| Fat | More vs. less | ||||||
| Fruits | Occasional vs. regular | ||||||
| Zhang CX 2011 [39] | Guangdong | Case-control study | Fat | Quartiles of intake Q4 vs. Q1 | 438 | 438 | 7 |
| Zhang CX 2009 [40] | Guangdong | Case-control study | Vegetables | Quartiles of intake Q4 vs. Q1 | 438 | 438 | 7 |
| Fruits | Quartiles of intake Q4 vs. Q1 | ||||||
| Shannon 2005 [41] | Shanghai | Case-control study | Soy foods | ≥1.1 servings/day vs. ≤2.6 servings/week | 378 | 1070 | 8 |
| Vegetables | ≥2.6 servings/day vs. ≤1.5 servings/day | ||||||
| Fruits | ≥1.2 servings/day vs. ≤3.9 servings/week | ||||||
| Shen YP 2006 [42] | Shanghai | Case-control study | Vegetables | >73000 g/year vs. ≤73000 g/year | 282 | 298 | 8 |
| Fruits | >41600 g/year vs. ≤41600 g/year | ||||||
| Yu ZG 2012 [43] | Shangdong | Case-control study | Soy foods | Nearly every day vs. never | 103 | 309 | 7 |
| Vegetables | Nearly every day vs. never | ||||||
| Lee 2005 [44] | Taiwan | Case-control study | Soy foods | >341 g/day vs. <114 g/day | 250 | 219 | 6 |
| Fat | >98 g/day vs. <56 g/day | ||||||
| Kallianpur 2008 [45] | Shanghai | Case-control study | Fat | Quartiles of intake Q4 vs. Q1 | 3452 | 3474 | 8 |
| Wang Q 2010 [46] | Sichuang | Case-control study | Fat | ≥77 g/day vs. <77 g/day | 400 | 400 | 8 |
| Dai Q 2001 [47] | Shanghai | Case-control study | Soy foods | >91 g/week vs. ≤35 g/day | 1459 | 1556 | 8 |
NOS, Newcastle-Ottawa Scale.