Table 1 |
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|
Exclusions of CHDS children from a 5-Year examination subset for organochlorine study |
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| Excluded |
||||
|
|
||||
| Step |
Reason for exclusion |
N |
% |
Cases remaining |
|
|
||||
| 1 |
Mother is an unmarried minor or no interview completed |
587 |
17.2 |
2825 |
| 2 |
Blood was drawn prior to second trimester or after 3rd trimester |
177 |
5.2 |
2648 |
| 3 |
Not a singleton birth |
28 |
0.8 |
2620 |
| 4 |
Raven or Peabody cognitive test score missing |
60 |
1.8 |
2560 |
| 5 |
Hearing tests were not done in both ears |
146 |
4.3 |
2414 |
| 6 |
Confounding anomalies present |
21 |
0.6 |
2393 |
| 7 |
Mother is deaf |
2 |
0.1 |
2391 |
| 8 |
Congenital rubella* |
46 |
1.3 |
2345 |
| 9 |
Mother took a drug containing iodine |
86 |
2.5 |
2259 |
| 10 |
Thyroid drugs were taken within 60 d of blood draw |
7 |
0.2 |
2252 |
| 11 |
Gestational age is less than 244 or greater than 351 days |
99 |
2.9 |
2153 |
| 12 |
No current address is available |
468 |
13.7 |
1685 |
| 13 |
Does not reside in 1 of 8 included counties |
337 |
9.9 |
1348 |
| 14 |
Only one sibling in family can be included; other siblings dropped |
57 |
1.7 |
1291 |
|
|
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|
*Included any mention of rubella in the chart, whether or not a diagnosis was made. |
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|
Hertz-Picciotto et al. Environmental Health 2008 7:37 doi:10.1186/1476-069X-7-37 |
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