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

 * indicates noncentred but scaled GA, divided by 100
 # indicates a centred variable – GA centred around mean of 40 weeks, maternal height centres around a mean of 162 cm