Table 2. Performance of models to provide continuous estimates of gestational age.
2 months storage (n=60) | 4 months storage (n=61) | 6 months storage (n=65) | 12 months storage (n=38) | |||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|
Fresh | Stored | ∆ | Fresh | Stored | ∆ | Fresh | Stored | ∆ | Fresh | Stored | ∆ | |
Model 1 | 1.42 wks | - | 1.35 wks | - | 1.11 wks | - | 1.60 wks | - | ||||
Model 2 | 1.21 wks | 1.20 wks | -0.00 | 1.04 wks | 1.08 wks | +0.04 | 0.93 wks | 1.16 wks | +0.24 | 1.39 wks | 1.48 wks | +0.10 |
∆ | -0.22 | -0.22 | -0.31 | -0.27 | -0.19 | +0.05 | -0.22 | -0.12 |
Data are expressed as RMSE, root mean squared error (average absolute deviation of ultrasound-validated vs. model estimated gestational in weeks); ∆, Black=unchanged, Green=improvement in model accuracy, Red=attenuation in model accuracy