| Author and published year (references) | Cases T/C | Diagnostic standard | Age (years), range, mean | Sex (male/female) |
| Li, 2012 [20] | 65/65 | DTDUD (2008) | T: 24–69, 43.2 | T: 45/20 | C: 22–70, 41.3 | C: 47/18 | Xiang, 2013 [21] | 59/61 | GPCRTPU | T: 39.4 | NR | C: 40.7 | Zhang, 2009 [22] | 25/24 | DDD (2006) | T: 27–52, 38 | T: 16/9 | C: 29–58, 39 | C: 13/11 | Zhang, 2013 [23] | 34/32 | Gastroscopy | T: 24–68, 34 | T: 20/14 | C: 20–65, 32 | C: 19/13 | Huang, 2014 [24] | 88/42 | Gastroscopy | T: 18–60, NR | NR | C: 18–60, NR | | Huang, 2016 [25] | 36/36 | DTDUD (2013) | T: 29–76, 35.6 | T: 21/15 | C: 28–74, 35.5 | C: 20/16 | McGrady, 2016 [26] | 43/43 | DTDUD (2013) | T: 20–65, 35.6 | T: 28/15 | C: 20–66, 36.1 | C: 25/18 | Xuan, 2008 [27] | 38/40 | Gastroscopy | T: 20–65, NR | NR | C: 20–65, NR | Zhu, 2016 [28] | 80/80 | Gastroscopy | T: 23–67, 38.9 | T: 52/28 | C: 19–65, 39.4 | C: 49/31 | Zhou, 2016 [29] | 62/62 | Gastroscopy | T: 47.2 | T: 37//25 | C: 46.4 | C: 36/26 | He, 2014 [30] | 35/32 | Gastroscopy | T: 18–72, 43 | T: 23/12 | C: 20–75, 45 | C: 22/10 | Chen, 2012 [31] | 26/27 | Gastroscopy | 24–78, 61.5 | 28/25 | Ou, 2014 [32] | 25/25 | Gastroscopy | 25–60, 45 | 26/24 | Yu, 2016 [33] | 60/60 | DTDUD (2013) | 18–70, NR | T: 40/20 | | C: 42/18 | Chen, 2017 [15] | 25/24 | DTDUD (2016) | T: 27–67, 44.5 | T: 14/11 | C: 26–68, 45.2 | C: 15/9 | Fan, 2015 [34] | 58/51 | Gastroscopy | T: 43.8 | T: 29/29 | C: 42.6 | C: 30/21 | Liang, 2011 [35] | 23/20 | Gastroscopy | T: 31–77, 49.1 | T: 15/8 | C: 27–72, 46.6 | C: 11/9 | Peng, 2010 [36] | 40/40 | Gastroscopy | T: 19–43, 33.5 | T: 26/14 | C: 19–42, 32.4 | C: 28/12 | Tian, 2015 [37] | 60/60 | PCDTDD (2005) | T: 17–67, 34.5 | T: 42/18 | C: 19–71, 33.5 | C: 40/20 | Ye, 2007 [38] | 33/32 | Gastroscopy | T: 20–63, 38.5 | NR | C: 20–65, 39.8 | Zhang, 2015 [39] | 70/70 | NR | T: 23–72, 45.2 | T: 42/28 | C: 25–70, 43.3 | C: 43/27 | Zhang, 2015 [40] | 37/37 | Gastroscopy | T: 29–72, 34.7 | T: 26/11 | C: 28–75, 35.8 | C: 24/13 |
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