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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