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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