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. Author manuscript; available in PMC: 2013 May 22.
Published in final edited form as: Early Hum Dev. 2011 Aug 16;88(2):111–118. doi: 10.1016/j.earlhumdev.2011.07.018

Table 3.

Hierarchical Multiple Regression Models of the Contribution of Gestational Age (GA) and Socioeconomic Status (SES) to IQ

Outcome Predictors R2 P (model) B SEB β P (predictor)
IQ .164 <001*
GA 1.118 .238 .405 <.001*
IQa .195 <001*
GA 1.204 .239 .436 <.001*
SES 5.796 2.796 .179 .040*

B indicates unstandardized coefficient; SE B, standard error of B; β, standardized coefficient.

a

Final model. Step 1, GA. For GA, higher GA was associated with higher IQ. Step 2, SES. For SES, higher SES was associated with higher IQ.

*

Significance set at p < .05.