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Table 6: Comparison of imaging modalities for each biometric measurement: estimated marginal means 95% CI
SI AP Perimeter SA
Mean 95% CI Mean 95% CI Mean 95% CI Mean 95% CI
At gestational age 29.6 wk^{^a} 
    US 2D 18.10 17.91–18.30 12.99 12.80–13.19 63.34 62.60–64.08 247.45 243.13–251.77
    US 3D 19.80 19.58–20.01 13.18 12.97–13.39 67.77 66.97–68.5 258.43 253.77–263.10
    MRI 16.47 16.23–16.70 11.40 11.17–11.64 60.68 59.80–61.55 181.04 175.90–186.1
For examinations preformed at ≥27 wk of gestation: mean gestational age, 31.3 wk 
    US 2D 19.28 19.05–19.51 13.88 13.64–14.11 67.20 66.31–68.10 276.99 271.53–282.45
    US 3D 17.80 17.57–18.03 12.36 12.13–12.59 65.34 64.48–66.20 212.94 207.68–218.20
    MRI 21.34 21.08–21.61 14.20 13.93–14.46 73.28 72.28–74.29 294.12 288.00–300.23
↵a Mean gestational age for all populations (516 fetuses).