Table 1

Characteristics of cases and controls and risk of glioma, according to respondent status

Characteristic	Including proxy-only interviews*						Excluding proxy-only interviews
	Cases		Controls		OR†	95% CI	Cases		Controls		OR†	95% CI
	No.	%	No.	%	OR†	95% CI	No.	%	No.	%	OR†	95% CI
All participants	798		1175				438		1141
Men	457	57	648	55	1.09	0.91 to 1.31	242	55	625	55	1.02	0.82 to 1.27
Women	341	43	527	45	Referent		196	45	516	45	Referent
Age in 1993 (mean (SD))	52.3 (16.1)		55.1 (15.4)		0.99	0.98 to 0.99	45.9 (15.3)		54.7 (15.4)		0.97	0.96 to 0.97
Ever had non-farm job (≥1 year)	762	95	1105	94	1.38	0.90 to 2.10	414	95	1076	94	1.07	0.64 to 1.80
Longest job
Professional	234	31	345	31	Referent		141	34	337	31	Referent
Trades	296	39	412	37	0.97	0.74 to 1.27	146	35	398	37	0.85	0.61 to 1.18
Service	230	30	346	31	0.94	0.72 to 1.22	125	30	339	32	0.81	0.58 to 1.12
White non-Latino	783	98	1152	98	1.24	0.64 to 2.42	429	98	1119	98	1.33	0.60 to 2.97
Education
College graduate	132	17	200	17	Referent		89	20	198	17	Referent
High school graduate	523	66	768	65	1.09	0.80 to 1.40	303	69	752	66	0.98	0.73 to 1.31
<12 years	143	18	207	18	1.27	0.91 to 1.75	46	11	191	17	0.97	0.63 to 1.51
Total	798		1175				438		1141

*Includes subject+proxy interviews for 137 cases and 49 controls.
†Adjusted for frequency matching variables (age group, sex) and age and education (except for education, which was adjusted for frequency matching variables and age, and age and gender, which were unadjusted).
Modified from table 4 from ref. 25.