Thank you for your interest in our article. Although we agree that green, blue, and yellow tracings were statistically indistinguishable, they all essentially identify fetuses unlikely to have acidemia. In contrast, there is no statistical difference between the proportion of category II tracings in the acidemic versus normal pH group (83% vs 79%, P = .99), suggesting that other characteristics of a category II tracing are needed to discriminate a healthy fetus from one in need of imminent delivery. Your additional statistical analysis prompted us to review our results. We found some errors in the table we sent to the journal, which we have resolved with the new table below ( Table ). Fortunately, this did not change our conclusions, but only strengthened them.
| Variable | Sensitivity, % | Specificity, % |
|---|---|---|
| Category I | 4.2 | 79.2 |
| Green | 8.3 | 66.7 |
| Blue | 0 | 75 |
| Green or blue | 8.3 | 58.3 |
| Category III | 12.5 | 100 |
| Orange | 41.7 | 100 |
| Red | 37.5 | 100 |
| Orange or red | 79.2 | 100 |
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