Table 2.
Agreement between NBDPS Study Interview and Birth Certificate for Parental Occupation by Maternal Characteristics
| Maternal Occupation | Paternal Occupation | |||||||
| Agreementa | Agreementa | |||||||
| Maternal characteristic | N (%) missing | N | % Missing included | % Missing excluded | N (%) missing | N | % Missing included | % Missing excluded |
| Age at delivery (in years) | ||||||||
| < 18 | 4 (6.1) | 51 | 77.3 | 82.3b | 33 (50.0) | 22 | 33.3 | 66.7c |
| 18 – 19 | 4 (5.6) | 46 | 64.8 | 68.7 | 27 (38.0) | 26 | 36.6 | 59.1 |
| 20 – 24 | 10 (5.8) | 118 | 68.6 | 72.8 | 40 (23.3) | 94 | 54.7 | 71.2 |
| 25 – 29 | 3 (1.8) | 128 | 78.5 | 80.0 | 23 (14.1) | 110 | 67.5 | 78.6 |
| 30 – 34 | 2 (1.7) | 104 | 87.4 | 88.9 | 14 (11.8) | 88 | 73.9 | 83.8 |
| 35 – 39 | 1 (2.3) | 30 | 69.8 | 71.4 | 2 (4.7) | 31 | 72.1 | 75.6 |
| 40 or older | 1 (6.7) | 12 | 80.0 | 85.7 | 2 (13.3) | 11 | 73.3 | 84.6 |
| Education (in years) | ||||||||
| 0 – 8 | 2 (3.8) | 42 | 80.8 | 84.0 | 17 (32.7) | 22 | 42.3 | 62.9d |
| 9 – 11 | 4 (3.0) | 98 | 74.2 | 76.6 | 47 (35.6) | 54 | 40.9 | 63.5 |
| 12 | 9 (4.1) | 153 | 70.2 | 73.2 | 45 (20.6) | 134 | 61.5 | 77.5 |
| 13 – 15 | 3 (1.9) | 126 | 79.2 | 80.8 | 22 (13.8) | 107 | 67.3 | 78.1 |
| 16 or more | 1 (1.2) | 70 | 86.4 | 87.5 | 4 (4.9) | 64 | 79.0 | 83.1 |
| Race/ethnicity | ||||||||
| Non-Hispanic White | 3 (1.4) | 166 | 76.1 | 77.2c | 30 (13.8) | 151 | 69.3 | 80.3 |
| Non-Hispanic Black | 2 (9.1) | 11 | 50.0 | 55.0 | 8 (36.4) | 9 | 40.9 | 64.3 |
| Hispanic | 13 (3.5) | 282 | 76.4 | 79.2 | 90 (24.4) | 202 | 54.7 | 72.4 |
| Other | 1 (3.2) | 29 | 93.5 | 96.7 | 5 (16.1) | 19 | 61.3 | 79.2 |
| Periconceptional folic acid usee | ||||||||
| Yes | 5 (2.2) | 175 | 77.1 | 78.8 | 25 (11.0) | 163 | 71.8 | 80.7 |
| No | 15 (3.6) | 314 | 75.3 | 78.1 | 111 (26.6) | 219 | 52.5 | 71.6d |
a N represents the number in each category that agreed. Missing cases are not included in chi-square statistics.
b p = 0.05, Fisher's exact probability.
c p < 0.05, Fisher's exact probability.
d p < 0.05.
e Periconceptional folic acid use included any use during the period one month prior through one month post concepton.