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Table 1 The characteristics of 14 cross-sectional studies

From: The relationship of different levels of high iodine and goiter in school children: a meta-analysis

Author Publish time Study time UIC (μg/L) WIC (mg/L) n N Prevalence of goiter Quality evaluation
Liu [15] 2010 1999 13.2 12 82 14.6 7
37.3 20 379 5.2
77.7 89 1015 8.8
125.5 84 1193 7.0
174.3 78 1329 5.9
248.1 199 2731 7.3
378.0 350 3682 9.5
599.1 237 2026 11.7
865.3 44 364 12.2
1157.5 14 183 7.5
2002 13.6 14 108 13.0
36.2 14 297 4.7
77.3 47 876 5.4
125.7 48 1225 3.9
174.7 57 1321 4.3
245.2 135 2322 5.8
371.0 140 2160 6.5
547.7 48 650 7.4
862.2 11 86 12.9
1274.4 3 56 6.0
  2005 10.6 19 172 11.0
36.0 33 426 7.7
77.7 62 1109 5.6
125.9 64 1392 4.6
175.8 72 1503 4.8
251.8 130 3012 4.3
368.1 141 2476 5.7
574.8 39 703 5.5
868.0 2 77 2.6
1200.0 7 69 10.1
2005 11.3 1 53 1.9
37.2 5 126 4.0
76.5 22 386 5.7
127.5 39 662 5.9
175.2 47 783 6.0
252.2 142 1824 7.8
393.8 452 3895 11.6
762.0 359 2621 13.7
868.0 114 675 16.9
1200.0 273 1531 17.8
2007 13.2 237 2419 9.8
46.2 807 6612 12.2
81.0 786 9251 8.5
124.4 548 7205 7.6
154.6 454 6401 7.1
244.5 832 10,274 8.1
357.2 764 8129 9.4
575.4 195 1623 12.0
875.6 11 96 11.5
1273.4 13 77 16.9
Wang [16] 2015 2012 271.0 11 291 3.8 7
692.6 28 300 9.3
Xiao [17] 2011 2007 319.2 61 731 8.3 7
189.8 69 1248 5.5
Jia [18] 2014 2014 74.3 73.8 11 196 5.6 7
312.8 144.7 25 189 13.2
455.6 258.5 20 158 12.6
793.5 501.0 18 165 10.9
Wang [19] 2015 2014 514.0 304.4 9 100 9.0 7
196.17 141.6 1 100 1.0
Yu [20] 2008 1999 83.5 192 2708 7.1 10
242.9 119 2708 4.4
650.9 187 2708 6.9
Liu [21] 2007 480.4  > 150.0 108 1458 7.4 6
228.0  ≤ 150.0 22 1229 1.8
Tang [22] 2006 612.5 124.2 ± 88.2 141 1184 11.9 6
269.4 136.6 ± 89.2 95 889 10.7
642.9 183.0 ± 190.2 148 1133 13.1 6
244.5 124.1 ± 105.1 129 862 9.7
499.7 112.3 ± 85.3 114 1032 11.1
Jia [23] 2006 460.5  > 150.0 84 570 14.7  
35 269 13.1
310.3  ≤ 150.0 60 656 9.1 6
23 316 7.3
Dai [24] 2013 2004–2010 433.3 55 211 26.1  
296.1 16 235 6.8
313.9 20 216 9.3 7
345.9 19 208 9.1
199.8 14 237 5.9
 ≤ 100.0 91 247 36.8
100.0–200.0 573 2019 26.4
200.0–300.0 294 1189 24.7
300.0–400.0 205 648 31.6
 > 400.0 741 2230 33.2