Table 1.
Agreement between volume sweep imaging protocol and standard of care ultrasound
| Variablea | Volume sweep imagingb | Standard of careb | Overall agreement | Cohens kappac | Confidenced |
|---|---|---|---|---|---|
| Live Fetus | 76.2% (67.8–83.3%) | 100% (97.1–100%) | 76.2% | …e | 3 (1–3) |
| Number of Fetuses (% single) | 100% (97.1–100%) | 100% (97.1–100%) | 100% | …e | 3 (2–3) |
| Fetal Presentation (% vertex) | 87.3% (77.3–94%) | 91.5% (82.5–96.8%) | 95.8% | 0.78 (0.53–1.00, p < 0.0001) | 3 (1–3) |
| Placental position | |||||
| Anterior Placenta | 52.0% (42.9–61.0%) | 50.4% (41.3–59.5%) | 85.6% (94.4%f) | 0.74 (0.63–0.85, p < 0.0001) | g |
| Posterior Placenta | 42.4% (33.6–51.6%) | 40.0% (31.3–49.1%) | |||
| Fundal Placenta | 5.6% (2.3–11.2%) | 9.6% (5.1–16.2%) | |||
| Placenta Previa | 4.0% (1.3–9.1%) | 0% (0–2.9%) | 96.0% | …e | 3 (1–3) |
| Placenta Previa (consensus read) | 3.2% (0.9–8.0%) | 96.8% | |||
| Amniotic Fluid Volume (% normal) | 99.2% (95.7–100%) | 100% (97.1–100%) | 99.2% | …e | 3 (1–3) |
| Normal Exam | 92.1% (85.9–96.1%) | 96.8% (92.1–99.1%) | 95.2% | 0.55 (0.20–0.90, p < 0.0001) | 3 (1–3) |
| Normal Exam (consensus read) | 92.9% (86.9–96.7%) | 96.0% | 0.60 (0.25–0.94, p < 0.0001) | ||
| Follow-up Recommendation (% normal) | 99.2% (95.7–100%) | 100% (97.1–100%) | 99.2% | …e | 3 (1–3) |
afor categories in which consensus reads resulted in changes, these are noted below the original variable
bvalues are percentage (95% confidence interval)
cvalues are kappa (95% confidence interval, p value)
dconfidence is specified as median (range)
enot defined, due to Peruvian radiologist labelling all identically
fagreement when fundal location included as agreeing with either anterior or posterior location
gnot given