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