Table 2. Birth and Gestational Characteristics of Study Control Subjects and Lymphoma Cases Diagnosed in California Between 1988 and 2007.

	Controls (n = 208015)		Lymphoma cases, total (n = 478)		Hodgkin lymphoma (n = 62)		Burkitt Lymphoma (n = 93)		Non-Hodgkin Lymphoma (n = 178)		Misc. and Unspecified Lymphoma (n = 145)
	N	%†	N	%†	N	%†	N	%†	N	%†	N	%†
Birth weight, g
< 2500	12119	5.8	26	5.5	2	3.2	7	7.5	10	5.6	7	4.9
2500-3999	173316	83.5	384	80.5	53	85.5	74	79.6	144	80.9	113	78.5
4000+	22114	10.7	67	14.0	7	11.3	12	12.9	24	13.5	24	16.7
missing	466		1		0		0		0		1
Gestational age, weeks
≤ 36	20118	10.2	45	9.9	1	1.8	11	12.2	14	8.2	19	13.7
37-42	168701	85.7	397	87.3	52	92.9	75	83.3	151	88.8	119	85.6
43+	8141	4.1	13	2.9	3	5.4	4	4.4	5	2.9	1	0.7
missing	11055		23		6		3		8		6
Size for gestational age
Small	20564	10.5	46	10.1	8	14.3	12	13.3	16	9.4	10	7.2
Normal	155308	79.0	349	76.9	45	80.4	67	74.4	132	77.6	105	76.1
Large	20653	10.5	59	13.0	3	5.4	11	12.2	22	12.9	23	16.7
missing	11490		24		6		3		8		7
Method of delivery
Vaginal	158662	76.3	375	78.5	48	77.4	73	78.5	137	77.0	117	80.7
Caesarean	49225	23.7	103	21.5	14	22.6	20	21.5	41	23.0	28	19.3
missing	128		0		0		0		0		0
Previous terminations
None	172122	82.8	395	82.6	51	82.3	74	79.6	153	86.0	117	80.7
1+	35679	17.2	83	17.4	11	17.7	19	20.4	25	14.0	28	19.3
missing	214		0		0		0		0		0
Parity
first birth	81785	39.3	172	36.0	22	35.5	31	33.3	74	41.6	45	31.0
second or third birth	100143	48.2	244	51.0	32	51.6	44	47.3	89	50.0	79	54.5
fourth or subsequent birth	25947	12.5	62	13.0	8	12.9	18	19.4	15	8.4	21	14.5
missing	140		0		0		0		0		0
Prenatal care initiation
During first trimester	164378	80.1	363	76.9	44	72.1	80	86.0	136	77.7	103	72.0
No care or after first trimester	40958	19.9	109	23.1	17	27.9	13	14.0	39	22.3	40	28.0
missing	2679		6		1		0		3		2

^†Percent of non-missing