Table 4.
Association and prediction of EFM patterns for normal and abnormal pH
| pH > 7.10 (n= 8431) | pH ≤ 7.10 (n= 149) | Adjusted RR (95% CI)* | Sensitivity (95% CI) | Specificity (95% CI) | |
|---|---|---|---|---|---|
| Normal pH | |||||
| Category I | |||||
| Always, No. (%) | 37 (0.4) | 0 (0.0) | -- | -- | -- |
| Mostly, No. (%) | 1038 (12.3) | 6 (4.0) | 1.01 (1.01, 1.02) | 55.2 (54.2, 56.4) | 64.4 (56.2, 72.1) |
| Ever, No. (%) | 6000 (71.2) | 78 (52.3) | 1.02 (1.01, 1.03) | 37.1 (36.0, 38.1) | 82.6 (75.5, 88.3) |
| Variability | |||||
| Always moderate, No. (%) | 2082 (24.7) | 27 (18.1) | 1.00 (0.99, 1.02) | 50.2 (49.1, 51.2) | 67.8 (59.6, 75.2) |
| Mostly moderate, No. (%) | 4856 (57.6) | 79 (53.0) | 1.00 (0.98, 1.01) | 50.1 (49.0, 51.1) | 67.7 (59.5, 75.1) |
| Accelerations | |||||
| Ever, No. (%) | 5790 (68.7) | 60 (40.3) | 1.02 (1.01, 1.03) | 66.6 (65.6, 67.6) | 61.7 (53.4, 69.6) |
| Abnormal pH | |||||
| Category III | |||||
| Always, No. (%) | -- | -- | -- | -- | -- |
| Mostly, No. (%) | -- | -- | -- | -- | -- |
| Ever, No. (%) | 18 (0.2) | 3 (2.0) | 8.72 (2.92, 26.04) | 69.1 (61.0, 76.4) | 50.1 (49.0, 51.2) |
| Baseline | |||||
| Ever bradycardic, No. (%) | 231 (2.7) | 5 (3.4) | 1.30 (0.54, 3.15) | 67.8 (59.6, 75.2) | 50.2 (49.1, 51.2) |
*
Adjusted for nulliparity, pregestational diabetes, and advanced maternal age