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Table 2 Differences of perchlorate, iodine levels in urine between control and case group

From: The risk of perchlorate and iodine on the incidence of thyroid tumors and nodular goiter: a case-control study in southeastern China

Variables

Pathological type

Overall participants

Controls

Cases

P-value a

P-value b

Median

25th-75th percentiles

Median

25th-75th percentiles

Median

25th-75th percentiles

Perchlorate (μg/L)

11.27

6.89-18.49

      
 

Total cases

  

9.29

6.35-14.74

14.31

8.25-20.58

< 0.001

 

NG

  

9.68

6.48-15.22

14.56

7.88-22.18

0.037

0.998

 

PTMC

  

9.95

6.88-14.70

14.13

7.56-21.64

0.061

 

PTC

  

8.73

5.75-13.39

14.27

8.67-19.16

0.002

Iodine (μg/L)

131.23

84.00-197.84

      
 

Total cases

  

131.59

82.13-183.25

131.23

84.46-214.92

0.153

 

NG

  

122.67

66.63-171.41

130.19

79.60-205.02

0.165

0.836

 

PTMC

  

138.58

100.43-181.96

148.34

95.15-213.52

0.589

 

PTC

  

130.35

84.74-189.80

126.97

88.82-215.71

0.697

  1. Note: Data are presented as medians and 25–75 percentiles. Perchlorate and iodine were corrected by urinary specific gravity (USG). NG nodular goiter, PTMC papillary thyroid micro carcinoma, PTC papillary thyroid carcinoma, Total cases including NG, PTMC and PTC
  2. a P-value were derived from Wilcoxon signed-rank test between the case and control group
  3. b P-value was derived from the Kruskal-Wallis test between the three types of pathological