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. Author manuscript; available in PMC: 2014 Sep 1.
Published in final edited form as: Dev Med Child Neurol. 2013 Jun 25;55(9):834–839. doi: 10.1111/dmcn.12191

Table I.

Prediction of neurodevelopmental outcomes at 12 months and 24 months using event-related potential (ERP) and clinical variables

Communication:
12mo		 Cognition:
12mo		 Receptive language:
24mo		 Expressive language:
24mo		 Cognition:
24mo
ERP
responses
  /ba/–/ga/  0.00   0.27   0.25  0.06  0.06
  /da/–/ga/   0.45 *   0.30   0.28  0.18  0.18
  /bu/–/gu/  0.12   0.27   0.25   0.36   0.36
  /du/–/gu/  0.07   0.31   0.29   0.48 *   0.48 *
Sex   0.49 *  0.00  0.00   0.27   0.27
Gestational
age		   0.46 *   0.60 *   0.56 **   0.27   0.27
Education   0.25  0.13  0.12   0.57 **   0.57 **
Age at ERP   1.41 **   0.38   0.35   0.45 *   0.45 *
Model R2
(%)		 42 33 22 24 24

Effect size is Cohen’s d based on a meta-analytic formula for effect size estimation.16 Cohen’s d guidelines are small/medium/large ~0.20/0.50/0.80. Effect size d appears in bold if greater than ‘small’ (0.2). According to Cohen, small/medium/large variances explained are Cohen’s f2=0.02/0.15/0.35. These translate to 2%/13%/26% for R2.

*

p<0.05

**

p<0.01.