Table 1 Distribution and characteristics of the primary studies included in the meta-analysis.
First author and publication year | Language | Location of study | U/R | Score | Total sample size | Total case size | |||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
Male | Female | Urban | Rural | Total | Male | Female | Urban | Rural | Class I | Class II | Class III | Total | |||||
Huang Caiping 2013 | C | Yu yao | U | 10 | 164 | 150 | — | — | 314 | 78 | 62 | — | — | 102 | 17 | 21 | 140 |
Wang Jing 2007 | C | Tang shan | U + R | 9 | 250 | 192 | — | — | 442 | 122 | 92 | — | — | 119 | 44 | 51 | 214 |
Yang Hongzhen 2010 | C | Bao ding | U + R | 10 | — | — | 459 | 470 | 929 | — | — | 212 | 224 | 132 | 45 | 259 | 436 |
Xiao Yan 2011 | C | Chang chun | U | 9 | 1,470 | 1,254 | — | — | 2,724 | — | — | — | — | — | — | — | 726 |
Huang Ning 2005 | C | Shuang liu | R | 9 | 696 | 583 | — | — | 1,279 | — | — | — | — | — | — | — | 491 |
Yin Yanchun 2014 | C | Da qing | U | 11 | — | - | — | — | 1,904 | — | — | — | — | 674 | 149 | 203 | 1,026 |
Li Zhaohui 2009 | C | De yang | U | 10 | 1,709 | 1,504 | — | — | 3,213 | 461 | 295 | — | — | — | — | — | 756 |
Lv Yulin 1988 | C | Fu zhou | U | 8 | 1,610 | 1,492 | — | — | 3,102 | 674 | 681 | — | — | — | — | — | 1,355 |
Zheng Zhijun 2006 | C | Gui yang | U | 9 | 255 | 201 | — | — | 456 | 54 | 59 | — | — | — | — | — | 113 |
He Hongxu 2011 | C | Ha erbing | U | 10 | — | — | — | — | 3,956 | — | — | — | — | 1,637 | 244 | 279 | 2,160 |
Liu Yingqi 2009 | C | Han dan | U | 9 | 735 | 627 | — | — | 1,362 | — | — | — | — | — | — | — | 514 |
Yang Zaibo 2010 | C | En shi | U + R | 9 | 956 | 906 | 966 | 896 | 1,862 | 518 | 478 | 523 | 473 | — | — | — | 996 |
Wan Jianying 2013 | C | De an | R | 12 | 800 | 800 | — | — | 1,600 | 265 | 303 | — | — | — | — | — | 568 |
Huang Guiyue 2015 | C | Kun ming | U | 12 | 1,124 | 992 | — | — | 2,116 | 770 | 746 | — | — | — | — | — | 1,516 |
Li Haifeng 2013 | C | Da lian | U | 9 | — | — | — | — | 2,448 | — | — | — | — | — | — | — | 527 |
Qu Ling 2001 | C | San ya | R | 9 | 563 | 439 | — | — | 1,002 | — | — | — | — | — | — | — | 207 |
Yang Tao 2013 | C | Chang chun | U | 8 | 145 | 170 | — | — | 315 | 67 | 82 | — | — | — | — | — | 149 |
Sun Xinhua 1990 | C | Chang chun | U | 9 | 548 | 452 | — | — | 1,000 | 304 | 259 | — | — | 288 | 52 | 223 | 563 |
Feng Jinqiu 2015 | C | Shang hai | U + R | 12 | 1,421 | 1,323 | — | — | 2,744 | 1,041 | 870 | — | — | — | — | — | 1,911 |
Weng Sien 2006 | C | Shang hai | U | 12 | 239 | 220 | — | — | 459 | — | — | — | — | 70 | 70 | 57 | 197 |
Zhao Fengmei 1999 | C | Shang hai | U | 9 | 1,062 | 1,062 | — | — | 2,124 | 216 | 228 | — | — | — | — | — | 444 |
Zhou Xinhua 2017 | E | Shang hai | U | 12 | 1,247 | 1,088 | — | — | 2,335 | 1,048 | 912 | — | — | — | — | — | 1,960 |
Zhang Cuicui 2014 | C | Shao yang | U + R | 9 | 950 | 850 | — | — | 1,800 | — | — | — | — | 570 | 266 | 147 | 983 |
Chen Min 2016 | C | Shao xing | U | 12 | 292 | 276 | — | — | 568 | 196 | 201 | — | — | — | — | — | 397 |
Zhao Zhenjin 2002 | C | Shen yang | U | 8 | — | — | — | — | 591 | — | — | — | — | 43 | 22 | 46 | 111 |
Li Lin 1992 | C | Urumchi | U | 11 | — | — | — | — | 491 | 129 | 103 | — | — | 157 | 28 | 47 | 232 |
Zhou Zhifei 2016 | E | Xi an | U + R | 12 | 1,185 | 1,050 | 1,518 | 717 | 2,235 | 776 | 706 | 935 | 547 | — | — | — | 1,482 |
Liu Yuan 2015 | C | Yi ning | U + R | 12 | 517 | 448 | 596 | 369 | 965 | 327 | 279 | 402 | 204 | — | — | — | 606 |
Wang Bing 2000 | C | Yin chuan | U | 8 | 749 | 597 | — | — | 1,346 | 96 | 81 | — | — | — | — | — | 177 |
Liang Xueping 1995 | C | Yun chen | U | 8 | — | — | — | — | 109 | — | — | — | — | — | — | — | 63 |
Fu Minkui 2002 | C | China | U + R | 11 | — | — | — | — | 5,309 | — | — | — | — | 1,423 | 536 | 793 | 2,752 |
