Table 3.
Random forest variable importance (VI) and regression coefficient from run 1: top 40 variables (dependent variable: newborn’s weight [g]).
| Variable | Random Forest | Linear Regression | ||
|---|---|---|---|---|
| VI Value | VI Rank | Coefficient | p-Value | |
| Gestational Age—Delivery (Weeks) | 81437955 | 1 | * 170.2000 | 0.0000 |
| GA36EFW1 (g) | 59566065 | 2 | * 0.3300 | 0.0000 |
| GA36AC1 (mm) | 40359557 | 3 | * 3.3950 | 0.0055 |
| Maternal Weight at Delivery Time (kg) | 12600886 | 4 | −2.9740 | 0.8606 |
| GA36BPD1 (mm) | 11536549 | 5 | 3.5670 | 0.2456 |
| Maternal BMI at Delivery Time | 9183122 | 6 | 25.9200 | 0.5537 |
| Neonatal Intensive Care Unit Hospitalization | 8666421 | 7 | * −45.8000 | 0.0265 |
| GA36FL1 (mm) | 8167498 | 8 | 0.8415 | 0.8153 |
| GA11CRL1 (mm) | 7670171 | 9 | −0.1804 | 0.8833 |
| GA21AC1 (mm) | 7394983 | 10 | 1.7720 | 0.0624 |
| GA21BPD2 (mm) | 7337688 | 11 | 3.0080 | 0.3310 |
| Maternal Pregestational BMI | 6918490 | 12 | −12.7300 | 0.7878 |
| GA21AC2 (mm) | 6435064 | 13 | 1.2240 | 0.1581 |
| GA21AC3 (mm) | 6019105 | 14 | * 3.7860 | 0.0039 |
| GA36HC1 (mm) | 5840288 | 15 | −0.1518 | 0.8389 |
| GA21BPD1 (mm) | 5804584 | 16 | 3.5090 | 0.2108 |
| GA20AC1 (mm) | 5174051 | 17 | 0.2379 | 0.3931 |
| GA20EFW1 (g) | 5113174 | 18 | −0.2566 | 0.1524 |
| Maternal Pregestational Weight (kg) | 5066332 | 19 | 1.8500 | 0.9193 |
| GA21EFW1 (g) | 4834716 | 20 | * 0.2289 | 0.0472 |
| GA21FL2 (mm) | 4749409 | 21 | −3.1040 | 0.4481 |
| GA20HC1 (mm) | 4713837 | 22 | −0.0199 | 0.9811 |
| GA21HC2 (mm) | 4646094 | 23 | −0.6821 | 0.3531 |
| Apgar Score in 1 Minute After Delivery | 4645375 | 24 | 0.4369 | 0.9574 |
| Apgar Score in 5 Minutes After Delivery | 4632233 | 25 | 2.7750 | 0.8193 |
| GA21EFW3 (g) | 4602151 | 26 | 0.0566 | 0.5850 |
| Maternal Height (cm) | 4570952 | 27 | 8.3310 | 0.3864 |
| GA14BPD1 (mm) | 4472051 | 28 | * 6.8380 | 0.0270 |
| Maternal Age | 4345422 | 29 | −2.3960 | 0.1433 |
| GA20BPD1 (mm) | 4297216 | 30 | −6.3500 | 0.0544 |
| GA21EFW2 (g) | 4291562 | 31 | * 0.2961 | 0.0005 |
| GA21FL1 (mm) | 4270426 | 32 | −4.0100 | 0.2977 |
| GA21HC1 (mm) | 4261178 | 33 | −0.3190 | 0.3783 |
| GA20FL1 (mm) | 4222331 | 34 | * 9.9590 | 0.0214 |
| GA14FL1 (mm) | 4186594 | 35 | * −9.4160 | 0.0486 |
| GA11NT1 (mm) | 4115745 | 36 | −2.3880 | 0.6990 |
| GA14AC1 (mm) | 3751675 | 37 | −0.6944 | 0.5587 |
| GA14HC1 (mm) | 3564844 | 38 | 0.9472 | 0.3295 |
| GA21D2 | 3276785 | 39 | * −15.1600 | 0.0002 |
| GA36W1 | 3209062 | 40 | * −90.3100 | 0.0000 |
Notes: * p-Value < 0.05; AC: Abdominal Circumference (mm); BPD: Biparietal Diameter (mm); CRL: Crown-Rump Length (mm); EFW: Estimated Fetal Weight (g); FL: Femur Length (mm); HC: Head Circumference (mm); NT: Nuchal Translucency (mm); GA11: Gestational Age, Week 11–Week 13; GA14: Gestational Age, Week 14–Week 19; GA20: Gestational Age, Week 20; GA21: Gestational Age, Week 21–Week 35; GA36: Gestational Age, Week 36 or Later; W/D: Gestational Age–Weeks/Days.