Table 1.

Descriptive Characteristics of the Study Population, a Case-Control Study of Hodgkin Lymphoma in Connecticut and Massachusetts, 1997–2000

Characteristic	Cases (n = 435)		Controls (n = 563)
	No.	%	No.	%
Sex
Male	220	51	306	54
Female	215	49	257	46
State of residence
Massachusetts	242	56	315	56
Connecticut	193	44	248	44
Age, yearsa
<50	361	83	451	80
≥50	74	17	112	20
Ethnicity
Caucasian	403	93	493	88
Non-Caucasian/missing	32	7	70	12
Body mass indexb
<25	232	53	264	47
25–29.9	135	31	199	35
≥30	68	16	100	18
Smoked ≥10 packs of cigarettes in lifetime
Yes	214	49	250	44
No	221	51	312	55
Missing	0	0	1	0.2
Day care or nursery school
Attended for ≥1 year	48	11	89	16
Attended for <1 year	89	20	107	19
Did not attend/missingc	298	69	367	65
Education
Less than high school	34	8	36	6
Completed high school	113	26	130	23
College or higher	288	66	396	70
Number of siblings
0	26	6	37	7
1–2	248	57	299	53
3–4	114	26	156	28
≥5	47	11	67	12
Unknown	0	0	4	1
Average aspirin use during the past 5 years
≥2 tablets per week	53	12	96	17
<2 tablets per week	371	85	440	78
Missing	11	3	27	5
Average acetaminophen use during the past 5 years
≥2 tablets per week	110	25	94	17
<2 tablets per week	312	72	438	78
Missing	13	3	31	5
Diagnosed with mononucleosis
Yes	58	13	81	14
No	368	85	478	85
Unknown	9	2	4	1
Alcohol intaked
Nondrinker	151	35	155	28
Drinker	284	65	408	72
Total caloric intakee,f	1,607 (442–4,119)		1,604 (433–4,398)
Histological type
Nodular sclerosing	295	68
Multiple cellularity	51	12
Other/undefined	89	20
Tumor EBV status
Positive	73	17
Negative	255	59
Unknown	107	24

Abbreviation: EBV, Epstein-Barr virus.

^a Age at diagnosis among cases and age at study entry among controls.

^b Expressed as weight (kg)/height (m)².

^c Unable to differentiate between participants who did not attend day care or nursery school and those missing this information.

^d Alcohol intake as reported on food frequency questionnaire.

^e Total caloric intake reported as the mean and range of values in kcal/day.

^f Values are expressed as mean (range).