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Table 1 Socio-demographic characteristics of subjects and their relationships with thyroid cancer

From: The association between diabetes and thyroid cancer risk: a hospital-based case-control study in China

Factors Cases
(N = 2937; %)
Controls
(N = 2937; %)
P
Age (Years) 49.27 ± 1.19 49.15 ± 1.20 Matched
 > 40 2264 (77.1) 2242 (76.3)  
 ≤ 40 672 (22.9) 692 (23.6)  
Sex    Matched
 Males 676 (23.0) 676 (23.0)  
 Females 2261 (77.0) 2261 (77.0)  
Education level    0.86
 No formal/primary school 1154 (39.3) 1146 (39.0)  
 Middle/high school 1231 (41.9) 1250 (42.6)  
 College/university/postgraduate 546 (18.6) 534 (18.2)  
Average monthly household income (Yuan)    0.01
 ≤ 2000 2127 (72.4) 2060 (70.1)  
 2000–5000 343 (11.7) 323 (11.0)  
 > 5000 464 (15.8) 548 (18.7)  
Smoking category    0.75
 Never 2543 (86.6) 2550 (86.8)  
 Ever and current 394 (13.4) 387 (13.2)  
Alcohol category    < 0.001
 Never 2179 (74.2) 1907 (64.9)  
 Occasional 542 (18.5) 716 (24.4)  
 Current regular 216 (7.4) 314 (10.7)  
Body mass index    < 0.001
 Normal weight 1594 (54.3) 1793 (61.0)  
 Underweight 91 (3.1) 141 (4.8)  
 Overweight 929 (31.6) 804 (27.4)  
 Obese 223 (7.6) 198 (6.7)  
Annual X-ray examination    < 0.001
 0 time 1155 (39.3) 1617 (55.1)  
 ≥ 1times 1782 (60.7) 1320 (44.9)  
Family history of diabetes    < 0.001
 Negative 458 (15.6) 285 (9.7)  
 Positive 153 (5.2) 166 (5.7)  
Family history of thyroid cancer    0.001
 Negative 528 (18.0) 412 (14.0)  
 Positive 83 (2.8) 32 (1.1)  
  1. Percentages of each variable may not equal 100 because of missing data or rounding.