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Observed and Bias-Adjusted Contingency Tables for Prepregnancy Obesity (Exposure) and Spina Bifida (Outcome), Selected National Birth Defects Prevention Study Sites, 1997–2009.
| Observed | Bias-Adjusteda | |||
|---|---|---|---|---|
|
|
||||
| Obese | Not Obese | Obese | Not Obese | |
| Case | 239 | 690 | 290.2 | 978.7 |
| Control | 1477 | 6297 | 1477.0 | 6297.0 |
Adjusted for selection bias due to incomplete ascertainment of cases among pregnancies terminated following prenatal diagnosis with spina bifida.
