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Table 1 The characteristics of study population

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

Characteristics

Controls (n = 184)

Cases (n = 184)

P-value

Gender, n (%)

  

 Male

65 (35.3)

65 (35.3)

 Female

119 (64.7)

119 (64.7)

Age (years), n (%)

  

 ≤ 44

115 (62.5)

116 (63.0)

 45-59

51 (27.7)

49 (26.6)

 ≥ 60

18 (9.8)

19 (10.4)

BMI (kg/m2, Mean ± SD)

23.37 ± 3.45

22.23 ± 2.74

< 0.001

Educational level, n (%)

  

0.746

 Elementary school and below

18 (9.8)

23 (12.5)

 Junior/ high school

88 (47.8)

80 (43.5)

 College Degree and above

78 (42.4)

81 (44.0)

Duration of residence (years), n (%)

  

0.219

 ≤ 5

19 (10.3)

22 (12.0)

 5-10

53 (28.8)

38 (20.7)

 >  10

112 (60.9)

124 (67.4)

Seafood, n (%)

  

0.325

 <  1 times/week

27 (14.7)

31 (16.8)

 1-2 times/week

139 (75.5)

144 (78.3)

 >  2 times/week

18 (9.8)

9 (4.9)

Smoking, n (%)

27 (14.7)

37 (20.1)

0.134

Drinking, n (%)

69 (37.5)

97 (52.7)

0.002

  1. Note: BMI Body mass index, SD Standard deviation
  2. P-value were derived from chi-square tests for categorical variables, Wilcoxon signed-rank test for continuous variables