Table 1.
Demographic variables of the maternal cohort
| Variables | Cases (N=1025) | Controls (N=1015) | p-value |
|---|---|---|---|
| Maternal age, years | 25.6 (6.0) | 25.7 (5.6) | 0.61 |
| Maternal race | |||
| Caucasian | 696 (67.9) | 690 (68.0) | 0.72 |
| African American | 234 (22.8) | 225 (22.2) | |
| Other | 95 (9.3) | 100 (9.8) | |
| Maternal Hispanic ethnicity | 210 (20.5) | 206 (20.3) | 0.96 |
| Paternal race | |||
| Caucasian | 675 (65.9) | 654 (64.4) | 0.99 |
| African American | 241 (23.5) | 244 (24.0) | |
| Other | 109 (10.6) | 117 (11.6) | |
| Paternal Hispanic ethnicity | 223 (21.8) | 222 (21.9) | 0.99 |
| Marital Status | |||
| Married, living with partner | 511 (49.9) | 577 (56.8) | |
| Divorced/widowed/separated, living w/partner | 19 (1.9) | 14 (1.4) | |
| Divorced/widowed/separated, NOT living w/partner | 26 (2.5) | 11 (1.1) | 0.007 |
| Never married, living with partner | 217 (21.2) | 187 (18.4) | |
| Never married, NOT living with partner | 250 (24.4) | 226 (22.3) | |
| Unknown or Missing | 2 (0.2) | 0 (0.0) | |
| Maternal education, highest level completed | |||
| Elementary school (K-5) | 8 (0.8) | 5 (0.5) | |
| Middle school (6–8) | 86 (8.4) | 71 (7.0) | 0.13 |
| High school / GED (9–12) | 514 (50.1) | 478 (47.1) | |
| College (13–16) | 411 (40.1) | 456 (44.9) | |
| Unknown or Missing | 6 (0.6) | 5 (0.5) | |
| Household income | |||
| $0 – $12,000 | 180 (17.6) | 169 (16.7) | |
| $12,001 – $24,000 | 163 (15.9) | 171 (16.8) | |
| $24,001 – $50,000 | 186 (18.1) | 176 (17.3) | 0.16 |
| $50,001 – $100,000 | 125 (12.2) | 161 (15.9) | |
| >$100,001 | 53 (5.2) | 70 (6.9) | |
| Unknown or declined to answer | 318 (31.0) | 268 (26.4) | |
| Insurance type | |||
| None/self-pay | 81 (7.9) | 57 (5.6) | |
| Public | 559 (54.5) | 530 (52.2) | 0.06 |
| Private | 382 (37.3) | 425 (41.9) | |
| Other | 2 (0.2) | 3 (0.3) | |
| Unknown or Missing | 1 (0.1) | 0 (0.0) | |
*
For numerical variables, the mean and the standard deviation (in parentheses) are listed; differences were tested using t-test. For categorical variables, the numbers of subjects and the corresponding percentages (in parentheses) are listed; and the differences tested using chi-squared test or using Fisher’s exact test if the observed value in any cell of the contingency table was less than 10.