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Table 2 Comparison of volume sweep imaging protocol biometry using strict criteria and standard of care ultrasound biometry

From: Testing telediagnostic obstetric ultrasound in Peru: a new horizon in expanding access to prenatal ultrasound

Variable Volume sweep imaginga Standard of carea p valueb Intraclass correlation coefficientc Bland-altman biasc
All Exams
 Biparietal Diameter (mm) 71.1 ± 20.3 (n = 111) 65.6 ± 18.7 < 0.0001 0.89 (0.50–0.96, p < 0.0001) 6.4 (−6.9–19.7, p < 0.0001)
 Head Circumference (mm) 250.0 ± 66.3 (n = 99) 236.0 ± 68.0 < 0.0001 0.86 (0.71–0.92, p < 0.0001) 17.5 (−45.0–79.9, p < 0.0001)
 Abdominal Circumference (mm) 243.0 ± 77.8 (n = 102) 224.0 ± 74.8 < 0.0001 0.81 (0.69–0.88, p < 0.0001) 18.6 (−66.2–103, p < 0.0001)
 Femur Length (mm) 41.8 ± 16.5 (n = 56) 46.3 ± 15.8 0.17 0.93 (0.88–0.96, p < 0.0001) 1.1 (−10.4–12.6, p = 0.17)
 Estimated Gestational Age (days) 195 ± 49 (n = 109) 186.0 ± 46.0 < 0.0001 0.95 (0.69–0.98, p < 0.0001) 10.4 (−10.6–31.5, p < 0.0001)
Second Trimester Exams
 Biparietal Diameter (mm) 56.2 ± 14.0 51.6 ± 13.0 < 0.0001 0.84 (0.54–0.93, p < 0.0001) 4.6 (−7.7–16.9, p < 0.0001)
 Head Circumference (mm) 202.0 ± 45.3 189.0 ± 47.6 0.0007 0.84 (0.69–0.91, p < 0.0001) 11.4 (−35.5–58.4, p < 0.0001)
 Abdominal Circumference (mm) 187.0 ± 50.8 168.0 ± 46.7 0.001 0.67 (0.45–0.80, p < 0.0001) 16.8 (−55.0–88.5, p < 0.0001)
 Femur Length (mm) 32.7 ± 9.6 34.6 ± 10.8 0.87 0.83 (0.70–0.91, p < 0.0001) 0.2 (−10.8–11.1, p = 0.87)
 Estimated Gestational Age (days) 158.0 ± 27.2 150.0 ± 27.0 < 0.0001 0.94 (0.65–0.98, p < 0.0001) 6.5 (−6.9–19.9, p p < 0.0001)
Third Trimester Exams
 Biparietal Diameter (mm) 90.0 ± 6.79 81.9 ± 7.7 < 0.0001 0.33 (−0.10–0.64, p < 0.0001) 8.7 (−4.6–22.0, p < 0.0001)
 Head Circumference (mm) 313.0 ± 22.6 291.0 ± 42.7 0.0001 0.38 (0.06–0.62, p = 0.001) 25.3 (−50.8–101, p < 0.0001)
 Abdominal Circumference (mm) 309.0 ± 44.7 289.0 ± 39.5 0.0007 0.28 (0.02–0.52, p = 0.015) 20.7 (−77.8–119, p < 0.0001)
 Femur Length (mm) 61.4 ± 9.5 59.9 ± 7.7 0.051 0.68 (0.32–0.87, p < 0.0001) 3.0 (−8.97–15, p = 0.051)
 Estimated Gestational Age (days) 242.0 ± 23.0 229.0 ± 18.4 < 0.0001 0.64 (−0.02–0.86, p < 0.0001) 15.2 (−9.46–39.9, p < 0.0001)
  1. avalues are mean ± standard deviation
  2. bp value using paired t-test
  3. cvalues are kappa (95% confidence interval, p value)