Table 1.

Distribution of Data on Demographic Factors in a Case-Control Study of Childhood Germ Cell Tumors and Maternal Diet During Early Pregnancy, Children's Oncology Group, United States, 1993–2001^a

Variable	Total						Males						Females
	Cases (n = 222)		Controls (n = 336)		ORb	95% CI	Cases (n = 69)		Controls (n = 141)		ORb	95% CI	Cases (n = 153)		Controls (n = 194)		ORb	95% CI
	No.	%	No.	%			No.	%	No.	%			No.	%	No.	%
Child's age, years
0	45	20.27	76	22.62	1.00	Referent	20	28.99	37	26.24	1.00	Referent	25	16.34	39	20.10	1.00	Referent
1–4	72	32.43	81	24.11	1.50	0.92, 2.44	32	46.38	34	24.11	1.74	0.84, 3.60	40	26.14	46	23.71	1.36	0.70, 2.62
5–10	39	17.57	84	25.00	0.78	0.46, 1.33	3	4.35	30	21.28	0.19	0.05, 0.68	36	23.53	54	27.84	1.04	0.54, 2.00
11–14	66	29.73	95	28.27	1.17	0.72, 1.90	14	20.29	40	28.37	0.65	0.29, 1.47	52	33.99	55	28.35	1.48	0.79, 2.77
Birth weight, g
≤3,000	56	25.23	74	22.02	1.33	0.89, 2.01	13	18.84	24	17.02	1.41	0.65, 3.06	43	28.10	49	25.26	1.24	0.76, 2.02
3,001–4,000	130	58.56	229	68.15	1.00	Referent	38	55.07	99	70.21	1.00	Referent	92	60.13	130	67.01	1.00	Referent
≥4,001	36	16.22	33	9.82	1.92	1.14, 3.23	18	26.09	18	12.77	2.61	1.23, 5.53	18	11.76	15	7.73	1.70	0.81, 3.54
Maternal age at index pregnancy, years
≤24	70	31.53	94	27.98	1.10	0.73, 1.68	20	28.99	30	21.28	1.90	0.89, 4.07	50	32.68	64	32.99	0.81	0.48, 1.35
25–29	81	36.49	120	35.71	1.00	Referent	20	28.99	57	40.43	1.00	Referent	61	39.87	63	32.47	1.00	Referent
30–34	46	20.72	90	26.79	0.76	0.48, 1.19	17	24.64	43	30.50	1.13	0.53, 2.41	29	18.95	46	23.71	0.65	0.36, 1.17
≥35	25	11.26	32	9.52	1.16	0.64, 2.10	12	17.39	11	7.80	3.11	1.19, 8.15	13	8.50	21	10.82	0.64	0.29, 1.39
Parity at index pregnancy
1	61	27.48	109	32.44	1.00	Referent	16	23.19	50	35.46	1.00	Referent	45	29.41	59	30.41	1.00	Referent
2	71	31.98	92	27.38	1.38	0.89, 2.14	24	34.78	39	27.66	1.92	0.90, 4.11	47	30.72	52	26.80	1.19	0.68, 2.06
3	45	20.27	79	23.51	1.02	0.63, 1.65	19	27.54	27	19.15	2.20	0.98, 4.96	26	16.99	52	26.80	0.66	0.36, 1.21
4 or more	45	20.27	56	16.67	1.44	0.87, 2.37	10	14.49	25	17.73	1.25	0.50, 3.15	35	22.88	31	15.98	1.48	0.80, 2.75
Maternal race
White	174	78.38	289	86.01	1.00	Referent	57	82.61	124	87.94	1.00	Referent	117	76.47	164	84.54	1.00	Referent
Nonwhite	48	21.62	47	13.99	1.70	1.09, 2.64	12	17.39	17	12.06	1.54	0.69, 3.43	36	23.53	30	15.46	1.68	0.98, 2.89
Maternal education
High school or less	87	39.19	98	29.17	1.00	Referent	24	34.78	31	21.99	1.00	Referent	63	41.18	67	34.54	1.00	Referent
Some post-high school	65	29.28	108	32.14	0.68	0.45, 1.03	21	30.43	48	34.04	0.57	0.27, 1.18	44	28.76	60	30.93	0.78	0.46, 1.31
College graduate	50	22.52	97	28.87	0.58	0.37, 0.91	22	31.88	44	31.21	0.65	0.31, 1.35	28	18.30	52	26.80	0.57	0.32, 1.02
Advanced degree	20	9.01	33	9.82	0.68	0.37, 1.28	2	2.90	18	12.77	0.14	0.03, 0.68	18	11.76	15	7.73	1.28	0.59, 2.75
Annual household income, $
<20,000	63	28.38	62	18.45	1.00	Referent	21	31.34	27	19.15	1.00	Referent	42	27.45	35	18.32	1.00	Referent
20,001–30,000	55	24.77	87	25.89	0.62	0.38, 1.01	14	20.90	34	24.11	0.53	0.23, 1.23	41	26.80	53	27.75	0.65	0.35, 1.18
30,001–50,000	53	23.87	102	30.36	0.51	0.32, 0.83	18	26.87	43	30.50	0.54	0.24, 1.19	35	22.88	58	30.37	0.50	0.27, 0.93
>50,000	49	22.07	82	24.40	0.59	0.36, 0.97	14	20.90	37	26.24	0.49	0.21, 1.13	35	22.88	45	23.56	0.65	0.35, 1.22
Vitamin use during pregnancy
Yes	190	85.59	309	92.24	1.00	Referent	62	89.86	134	95.04	1.00	Referent	128	83.66	174	90.16	1.00	Referent
No	32	14.41	26	7.76	0.50	0.29, 0.86	7	10.14	7	4.96	0.46	0.16, 1.38	25	16.34	19	9.84	0.56	0.30, 1.06

Abbreviations: CI, confidence interval; OR, odds ratio.

^aMissing information on sex for 1 control.

^bOdds ratio from logistic regression.