Table 2.

Comparison between cases and controls concerning smoking habits.

Sample characteristics	Cases (235)		Controls (97)		OR	CI	P value
	N	%	N	%
Smoker	111	47.2	31	32	1.849	1.120–3.052	0.015
Previous smoker	31	13.2	24	24.7	0.707	0.372–1.345	0.290
Years of smoking							0.001
<5 years	5	2.1	9	9.3
5–10 years	29	12.3	13	13.4
>10 years	97	41.3	23	23.7
Quantity of cigarettes							0.502
<10 cig.	26	11.1	11	11.3
10–20 cig.	74	31.5	19	19.3
>20 cig.	32	13.6	11	11.3