Table 1

Description of the study population

	Cases		Controls
	n	%	N	%
Total	1906		5565
Sex
Males	507	26.6	2484	44.6
Females	1399	73.4	3081	55.4
Country
Australia	254	13.3	669	12
Canada	94	4.9	653	11.7
France	145	7.6	472	8.5
Germany	379	19.9	1535	27.6
Israel	737	38.7	987	17.7
NZ	50	2.6	160	2.9
UK	247	13.0	1092	19.6
Age (years)
<25	4	0.2	33	0.6
25–34	79	4.1	390	7
35–44	272	14.3	1117	20.1
45–54	658	34.5	1765	31.7
55–64	524	27.5	1529	27.5
65–74	252	13.2	582	10.5
75–84	102	5.4	132	2.4
85+	15	0.8	17	0.3
Smoking
Current	486	25.5	1501	27
Ex	397	20.8	1319	23.7
Never	1023	53.7	2745	49.3
Maximum level of education attained
Primary, secondary	1146	60.1	2998	53.9
Intermediate college, professional	361	18.9	1045	18.8
Tertiary	392	20.6	1511	27.2
Unknown	7	0.4	11	0.2
SIOPS SES scale in quartiles
<35	550	28.9	1369	24.6
35–42.8	439	23	1369	24.6
42.9–52	417	21.9	1369	24.6
52.1+	421	22.1	1369	24.6
Unknown	79	4.1	90	1.6
Marital status
Single, divorced and widowed	465	24.4	1306	23.4
Married	1434	75.2	4244	76.3
Don't know/missing data	7	0.4	15	0.3
Benign or malignant
NA	–	–	5565	100
Malignant	15	0.8	–	–
Benign	1891	99.2	–	–