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