Table 6 Criterion range and specificity of weeks after placental perfusion examination in screening for unexplained stillbirths at given false negative rates
From: Abnormal placental perfusion and the risk of stillbirth: a hospital-based retrospective cohort study
| Stratification | False negative rate | |||||||
|---|---|---|---|---|---|---|---|---|
| 1.0% | 2.5% | 5.0% | 10.0% | |||||
| Criterion range (weeks) | Specificity (%, (95% CI)) | Criterion range (weeks) | Specificity (%, (95% CI)) | Criterion range (weeks) | Specificity (%, (95% CI)) | Criterion range (weeks) | Specificity (%, (95% CI)) | |
| Placental perfusion | ||||||||
| Normal group | 3.0–15.7 | 66.89 (65.24–83.29) | 3.0–15.7 | 68.26 (65.61–83.74) | 3.0–15.4 | 75.08 (67.13–90.24) | 3.0–15.0 | 83.58 (67.65–93.62) |
| APP group | 5.0–17.6 | 11.29 (9.65–61.00) | 5.0–17.6 | 11.85 (9.89–62.43) | 5.0–17.5 | 12.78 (10.31–84.98) | 5.0–17.1 | 61.39 (11.19–89.62) |
| Sex | ||||||||
| Male | 3.0–14.6 | 89.24 (88.47–92.89) | 3.0–14.6 | 89.55 (88.57–93.27) | 3.0–14.6 | 90.06 (88.75–93.73) | 3.0–14.1 | 93.02 (89.17–94.63) |
| Female | 4.0–17.6 | 13.87 (12.94–67.78) | 4.0–17.5 | 14.66 (13.21–68.94) | 4.0–15.7 | 67.17 (13.95–83.56) | 4.0–15.7 | 69.29 (14.55–84.20) |
| Combination | ||||||||
| Normal and male | 3.0–14.1 | 93.37 (92.65–95.09) | 3.0–14.1 | 93.49 (92.76–95.22) | 3.0–14.1 | 93.68 (92.90–95.47) | 3.0–14.0 | 94.05 (93.03–95.90) |
| Normal and female | 4.0–15.7 | 68.28 (66.92–77.05) | 4.0–15.7 | 69.02 (67.17–84.48) | 4.0–15.7 | 70.27 (67.49–84.85) | 4.0–15.4 | 77.06 (68.01–85.60) |
| APP and male | 5.1–14.6 | 84.06 (81.53–89.19) | 5.1–14.6 | 84.17 (81.64–89.37) | 5.1–14.6 | 84.35 (81.83–89.49) | 5.1–14.5 | 84.72 (82.21–89.91) |
| APP and female | 5.0–17.6 | 12.32 (9.89–61.80) | 5.0–17.6 | 12.60 (10.03–62.36) | 5.0–17.5 | 13.06 (10.16–63.35) | 5.0–17.5 | 13.98 (10.41–66.22) |