Table 1. Sociodemographic characteristics of HL cases and their controls by age groups.

	Controls n=2465		Cases n=340
	n	%	n	%
Subjects <35 years old
Histology
HLNS			121	67.6
HLMC			29	16.2
Other classical HL			19	10.6
Unclassical HL			10	5.6
Sex
Male	162	51.9	90	50.3
Female	150	48.1	89	49.7
Age (years)
<25	106	34.0	66	36.9
≥25 and <30	99	31.7	71	39.7
≥30 and <35	107	34.3	42	23.5
Educational level
Missing data	1		0
Low	55	17.7	29	16.2
Medium	192	61.7	117	65.4
High	64	20.6	33	18.4
Lifetime residence
Missing data	1		0
Never rural	178	57.2	95	53.1
Ever rural	133	42.8	84	46.9
Subjects ≥35 years old
Histology
HLNS			72	44.7
HLMC			40	24.8
Other classical HL			35	21.7
Unclassical HL			14	8.7
Sex
Male	1160	53.9	95	59.0
Female	993	46.1	66	41.0
Age
≥35 and <40	134	6.2	43	26.7
≥40 and <45	144	6.7	22	13.7
≥45 and <50	172	8.0	17	10.6
≥50 and <55	243	11.3	22	13.7
≥55 and <60	255	11.8	15	9.3
≥60 and <65	309	14.4	13	8.1
≥65 and <70	342	15.9	12	7.5
≥70 and <75	277	12.9	8	5.0
≥75 and <80	212	9.9	8	5.0
≥80 and <85	50	2.3	1	0.6
≥85 and <100	15	0.7	0	0.0
Educational level
Missing data	0		1
Low	1067	49.6	65	40.6
Medium	809	37.6	65	40.6
High	277	12.9	30	18.8
Lifetime residence
Missing data	1		1
Never rural	849	39.5	63	39.4
Ever rural	1303	60.6	97	60.6

HL=Hodgkin's lymphoma.

HLNS=Hodgkin's lymphoma nodular sclerosis.

HLMC=Hodgkin's lymphoma mixed cellularity.