Table 1.
Parameter estimates obtained by fitting Equation 2 to birth weight-GA data extracted from Arbuckle et al. (20) and previously reported by Kuruvilla et al. (19). Based on the subject characteristics (male/female and singleton/twin), the A, B, C, D, E, M and γ were fixed to the values listed in Table 1.
| Male, Singleton | Female, Singleton | Male, Twin | Female, Twin | |
|---|---|---|---|---|
| A (g·d−4) | −1.21×10−5 | −1.60×10−5 | −9.09×10−6 | −1.28×10−5 |
| B (g·d−3) | 9.37×10−3 | 1.28×10−2 | 6.72×10−3 | 1.01×10−2 |
| C (g·d−2) | −2.53 | −3.66 | −1.73 | −2.87 |
| D (g·d−1) | 3.0×102 | 4.61×102 | 1.98×102 | 3.67×102 |
| E (g) | −1.30×104 | −2.15×104 | −8.40×103 | −1.78×104 |
| Ma (g) | 46.83 | 30.70 | 25.65 | 13.61 |
| γa (d−1) | 1.65×10−2 | 1.86×10−2 | 1.97×10−2 | 2.27×10−2 |
a
M and γ are parameters of the exponential function used to describe the intrauterine growth for GA less than 154 d (Equation 2). A, B, C, D and E are parameters of the polynomial function (Equation 2).