Table 3.

ORs and 95% CIs of DTC risk factors related to personal history and lifestyle characteristics

Variables	Cases (n = 203)	Controls (n = 212)	Crude OR1 (95% CI)	Adjusted OR2 (95% CI)
Blood group (unknown n = 56)
O	100	77	1*	1*
A	56	69	0.6 (0.4 – 1)	0.7 (0.4 – 1.1)
B	15	31	0.4 (0.2 – 0.8)	0.4 (0.2 – 0.9)
AB	7	4	1.2 (0.3 – 4.3)	3.1 (0.7 – 12.7)
Rhesus factor (unknown n = 55)
Negative	13	36	1*	1*
Positive	166	145	3.2 (1.6 – 6.3)	3.4 (1.6 – 7.0)
BSA3 (m2)
Men <1.90; women <1.60	43	63	1*	1*
Men 1.90 – 2.05; women 1.60 – 1.74	65	74	1.2 (0.7 – 2.1)	1.2 (0.7 – 2.1)
Men >2.05; women >1.74	95	75	1.7 (1.0 – 2.9)	1.5 (0.9 – 2.6)
Size of waist (cm)
Men <76; women <74	72	110	1*	1*
Men 76–≤91; women 74 – 84	56	48	1.8 (1.1 – 3.0)	1.4 (0.8 – 2.5)
Men >91; women >84	75	54	2.2 (1.4 – 3.6)	1.4 (0.8 – 2.6)
Other thyroid disorders
None	128	197	1*	1*
Goiter	65	10	8.8 (4.4 – 17.5)	10.1 (4.8 – 21.2)
Hyper-/hypothyroidism	10	5	3.6 (1.2 – 10.9)	4.5 (1.3 – 14.9)
Diabetes
No	196	207	1*	1*
Yes	7	5	1.8 (0.5 – 6.2)	1.8 (0.5 – 7.1)
Living conditions
Agricultural occupation
No	182	205	1*	1*
Yes	21	7	4.0 (1.6 – 9.7)	3.7 (1.4 – 9.5)
Exposure to chemicals
No	177	179	1*	1*
Yes	26	33	0.8 (0.5 – 1.5)	0.7 (0.4 – 1.3)
Water supply
Only public water network	158	191	1*	1*
Fountain	4	3	1.6 (0.4 – 7.4)	1.3 (0.3 – 6.9)
Artesian well	40	9	5.2 (2.4 – 11.2)	4.3 (1.9 – 9.6)
Missing	1	9
Alcohol consumption (glasses/week)
0	167	130	1*	1*
1 – 5	29	64	0.3 (0.2 – 0.6)	0.3 (0.2 – 0.6)
≥6	7	18	0.4 (0.1 – 0.9)	0.4 (0.1 – 1.1)

¹Stratified for gender and age classes.

²Stratified for gender and age classes and adjusted for smoking status, ethnic group, level of education, number of pregnancies, height, and BMI.

³Height and BMI are not included in adjustment variables for BSA.

^*Reference category.