Table 1 Demographic characteristics of mothers
Controls | Unilateral cases | Bilateral cases | |
|---|---|---|---|
Characteristics | (N = 146) | (N = 185) | (N = 95) |
N (%) | N (%) | N (%) | |
Mother’s race | |||
White non-Hispanic | 111 (76) | 105 (56.8) | 66 (69.5) |
Black non-Hispanic | 5 (3.4) | 14 (7.6) | 3 (3.2) |
Hispanic | 18 (12.3) | 46 (24.9) | 12 (12.6) |
Other | 12 (8.2) | 20 (10.8) | 14 (14.7) |
Mother’s educational attainment | |||
Less than High school | 6 (4.1) | 15 (8.1) | 9 (9.5) |
High school graduate | 15 (10.3) | 32 (17.3) | 13 (13.7) |
Some college or other training | 26 (17.8) | 40 (21.6) | 16 (16.8) |
College graduate or more | 99 (67.8) | 98 (53.0) | 57 (60.0) |
Mother’s age at child’s birth | |||
< 25 | 20 (13.7) | 31 (16.8) | 17 (17.9) |
25–29 | 45 (30.8) | 59 (31.9) | 25 (26.3) |
30–34 | 58 (39.7) | 61 (33.0) | 29 (30.5) |
35–39 | 21 (14.4) | 26 (14.1) | 21 (22.1) |
40+ | 2 (1.4) | 8 (4.3) | 3 (3.2) |
Total household income | |||
Less than $35,000 | 29 (19.9) | 56 (30.3) | 27 (28.4) |
$35,000–50,000 | 19 (13.0) | 18 (9.7) | 11 (11.6) |
$50,000–75,000 | 30 (20.6) | 30 (16.2) | 18 (19.0) |
More than $75,000 | 60 (41.1) | 62 (33.5) | 32 (33.7) |
Refused/do not know | 8 (5.5) | 19 (10.3) | 7 (7.4) |
Mother smoked in the month before or during pregnancy | |||
Yes | 17 (11.6) | 42 (22.7) | 19 (20.0) |
No | 127 (87.0) | 142 (77.2) | 75 (78.9) |
Missing | 2 (1.4) | 1 (76.8) | 1 (1.1) |