Table 4.

Parameter estimates for the square root of optimal fetal weight (grams)

				95% CI
Parameter	Variable	Estimate	SE	Lower	Upper	p -value
β0	Intercept	−4.311	0.2097	−4.7223	−3.8997	<.0001
β1	$\frac{\text{Time}}{300}$	35.4907	1.3364	32.8702	38.1111	<.0001
β2	${\left(\frac{\text{Time}}{300}\right)}^2$	−66.8095	3.0939	−72.8763	−60.7428	<.0001
β3	${\left(\frac{\text{Time}}{300}\right)}^3$	61.7716	3.0934	55.7058	67.8373	<.0001
β4	${\left(\frac{\text{Time}}{300}\right)}^4$	−22.0933	1.1304	−24.3099	−19.8767	<.0001
β5	Male	0.0112	0.003276	0.004766	0.01763	0.0007
β6	Second birth	0.001354	0.003832	−0.00617	0.008876	0.7239
β7	Third birth	0.01575	0.004821	0.006291	0.02522	0.0011
β8	Fourth birth or more	0.02281	0.006053	0.01093	0.03469	0.0002
β9	Maternal height -162	−0.00155	0.000729	−0.00298	−0.00012	0.0336
β10	Time (Maternal height – 162)	0.003979	0.001003	0.002012	0.005945	<.0001