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Table 5 Parameter estimates modelling birth crown heel length to the power of 0.75 (cm)

From: Optimal fetal growth for the Caucasian singleton and assessment of appropriateness of fetal growth: an analysis of a total population perinatal database

Independent Variable Parameter Estimate Standard Error t value Pr >|t| 95% confidence limits
   Intercept 5.684 0.176 32.30 <.0001 5.34 6.03
   Scaled gestational age squared* 209.9 3.66 57.31 <.0001 203 217
   Scaled gestational age cubed* -318.5 6.44 -49.43 <.0001 -331 -305
   Male infant 0.2350 0.0047 50.08 <.0001 0.226 0.244
   Maternal height c# 0.01665 0.00042 40.28 <.0001 0.0158 0.0174
   2nd birth 0.07484 0.0054 13.89 <.0001 0.064 0.085
   3rd birth 0.1161 0.0070 16.62 <.0001 0.102 0.130
   4th and subsequent birth 0.1508 0.0094 16.09 <.0001 0.132 0.169
   GA# × Maternal height 0.000763 0.000215 3.54 0.0004 0.00034 0.00120
Adjusted R 2 for this model is 0.322
  1. * indicates non-centred but scaled GA, divided by 100
  2. # indicates a centred variable – GA centred around mean of 40 weeks, maternal height centres around a mean of 162 cm