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Table 4 Parameter estimates modelling the square root of birth weight (grams)

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 -14.08 0.73 -19.36 <.0001 -15.51 -12.66
   GA 3 * -1413.6 25.0 -56.43 <.0001 -1463 -1365
   GA 3 In (GA 3) * -2782.5 39.4 -70.55 <.0001 -2860 -2705
   Male infant 1.185 0.027 44.22 <.0001 1.13 1.24
   Maternal height cm# 0.1077 0.0024 45.63 <.0001 0.103 0.112
   2nd birth 1.0277 0.031 33.40 <.0001 0.967 1.088
   3rd birth 1.318 0.0399 33.04 <.0001 1.24 1.40
   4th and subsequent birth 1.571 0.054 29.33 <.0001 1.46 1.68
   GA# × Maternal height 0.00667 0.00123 5.42 <.0001 0.0043 0.0091
Adjusted R 2 for this model is 0.405
  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