Skip to main content

Table 1 Agreement between volume sweep imaging protocol and standard of care ultrasound

From: Testing telediagnostic obstetric ultrasound in Peru: a new horizon in expanding access to prenatal 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)
  1. afor categories in which consensus reads resulted in changes, these are noted below the original variable
  2. bvalues are percentage (95% confidence interval)
  3. cvalues are kappa (95% confidence interval, p value)
  4. dconfidence is specified as median (range)
  5. enot defined, due to Peruvian radiologist labelling all identically
  6. fagreement when fundal location included as agreeing with either anterior or posterior location
  7. gnot given