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Table 1 The baseline characteristics of female subjects and their relationships with thyroid cancer

From: Menstrual, reproductive and hormonal factors and thyroid cancer: a hospital-based case–control study in China

Factors Cases (N = 2261; %) Controls
(N = 2261; %)
P OR 95% CI
Age (Years) 49.44 ± 1.16 49.32 ± 1.18   Matched  
Education level      
 No formal/primary school 985 (43.56) 968 (42.81)   Ref  
 Middle/high school 913 (40.38) 904 (39.98) 0.658 0.96 0.82–1.13
 College/university/postgraduate 359 (15.88) 384 (16.98) 0.136 0.82 0.64–1.06
Marriage status      
 Unmarried 105 (4.64) 91 (4.02)   Ref  
 Married 2151 (95.13) 2170 (95.98) 0.163 0.75 0.51–1.12
Average monthly household income (Yuan)      
  ≤ 2000 1646 (72.80) 1598 (70.68)   Ref  
 2000–5000 271 (11.99) 242 (10.70) 0.947 1.01 0.81–1.25
  > 5000 341 (15.08) 415 (18.35) 0.001 0.69 0.55–0.85
Body mass index (kg/m2)      
 Normal weight (18.5–23.9) 1298 (57.41) 1416 (62.63)   Ref  
 Underweight (< 18.5) 79 (3.49) 122 (5.40) 0.012 0.67 0.49–0.91
 Overweight (24.0–27.9) 652 (28.84) 581 (25.70) 0.002 1.26 1.09–1.45
 Obese (≥ 28.0) 157 (6.94) 142 (6.28) 0.073 1.25 0.98–1.59
Alcohol category      
 Never 1848 (81.73) 1670 (73.86)   Ref  
 Occasional 337 (14.90) 495 (21.89)  < 0.001 0.55 0.47–0.66
 Current regular 76 (3.36) 96 (4.25) 0.013 0.66 0.48–0.92
History of goiter      
 No 1346 (59.53) 633 (28.00)   Ref  
 Yes 181 (8.01) 19 (0.84)  < 0.001 8.67 3.72–20.18
History of nodules      
 No 1175 (51.97) 555 (24.55)   Ref  
 Yes 352 (15.57) 96 (4.25)  < 0.001 2.35 1.66–3.32
  1. OR odds ratio, CI confidence interval, Ref. reference
  2. Percentages of each variable may not equal 100 because of missing data or rounding