Table 2.
Odds ratio (ORs) and 95% Confidence Interval (CI) of thyroid cancer risk factors.
| Variables | Case n (%) |
Control n (%) |
Crude OR (95% CI) |
Adjusted OR 1
(95% CI) |
|---|---|---|---|---|
| Education level | ||||
| Elementary school | 17(16.3) | 13 (6.0) | * | * |
| Middle school | 31 (29.8) | 53 (24.5) | 0.447 (0.192–1.044) |
0.397 (0.066–2.371) |
| High school | 40 (38.5) | 111 (51.4) | 0.289 (0.129–0.647) |
0.271 0.037–1.964) |
| University | 16 (15.4) | 39 (18.1) | 0.314 (0.124–0.793) |
0.667 (0.074–6.013) |
| BMI 2 | 22.2+/–4.7 | 20+/–3.8 |
1.120
(1.058–1.185) |
1.118
(1.019–1.225) |
| BMI 2 | ||||
| 18.5–24.9 | 58 (69.9) | 105 (82.0) | * | * |
| 25.0–29.9 | 15 (18.1) | 17 (13.3) | 1.570 (0.731–3.371) |
3.728 (0.606–22) |
| ≥30.0 | 10 (12.0) | 6 (4.7) |
2.966
(1.026–8.571) |
7.581
(1.295–44) |
| Smoking status | ||||
| Never smoker | 80 (77.7) | 155 (71.4) | * | * |
| Current smoker | 23 (22.3) | 62 (28.6) | 0.741 (0.431–1.274) |
0.281 (0.063–1.253) |
| Alcohol consumption | ||||
| No | 74 (72.5) | 176 (81.1) | * | * |
| Yes | 28 (27.5) | 41 (18.9) | 1.660 (0.961–2.868) |
2.081 (0.534–8.107) |
| Irregular cycles | ||||
| No | 39 (78.0) | 67 (83.8) | * | * |
| Yes | 11 (22.0) | 13 (16.3) | 1.383 (0.567–3.374) |
2.090 (0.421–10) |
| Number of pregnancies | ||||
| Nullipara | 8 (10.7) | 15 (19.2) | * | * |
| 1 | 9 (12.0) | 13 (16.7) | 1.154 (0.353–3.776) |
1.308 (0.103–16) |
| 2 | 39 (52.0) | 33 (42.3) | 1.970 (0.764–5.081) |
1.063 (0.193–5.868) |
| 3 and more | 19 (25.3) | 17 (21.8) | 1.863 (0.649–5.345) |
0.452 (0.050–4.074) |
1 Each odds ratio is adjusted for gender, age, and for all other variables in the table. * Reference category. 2 BMI: Body mass index; weight (kg)/height (m2). Bold indicates ORs statistically significant.