Table 1

Demographic factors

Factor	Case			Control			OR^a	95% CI
Factor		n	%	n	%		OR^a	95% CI
Gender
Male	279	55.4	251	49.8	1.0
Female	225	44.6	253	50.2	0.8	0.6–1.0
Mother’s race
White	409	81.2	396	78.6	1.0
Black	36	7.1	39	7.7	0.7	0.4–1.4
Hispanic	41	8.1	54	10.7	0.6	0.4–1.1
Other	18	3.6	15	3.0	1.3	0.6–2.8
Mother’s education
<High school	54	10.7	51	10.1	2.2	0.8–6.3
High school	341	67.7	318	63.1	1.3	0.9–1.8
College	109	21.6	135	26.8	1.0
Mother’s age
<20 yr	44	8.7	35	6.9	1.3	0.6–2.7
20–24	112	22.2	110	21.8	1.2	0.8–1.8
25–30	200	39.7	206	40.9	1.0
31–39	138	27.4	146	29.0	0.8	0.6–1.2
40+	10	2.0	7	1.4	3.5	0.7–16.8
Household income in birth year (in thousands)
<$10	84	17.7	54	11.1	1.6	0.8–3.3
$10–20	85	17.9	91	18.7	1.4	0.7–2.7
$21–30	82	17.3	114	23.5	1.0
$31–40	73	15.4	86	17.7	1.8	0.9–3.6
$41–50	51	10.7	52	10.7	1.0	0.4–2.3
>$50	100	21.0	89	18.3	1.6	0.7–3.5

^a Unadjusted matched OR.