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. Author manuscript; available in PMC: 2014 Jun 1.
Published in final edited form as: Dev Psychol. 2012 Jul 16;49(6):1045–1057. doi: 10.1037/a0029390

Table 1.

Means, Standard Deviations, Sample Size, and Bivariate Correlations Among Study Variables

Variable M SD n 1 2 3 4 5 6 7 8 9 10
Birth Mother Predictors
1. Prenatal Risk 9.18 6.49 361 __
2. Verbal IQ 9.47 2.64 313 −.04 __
3. Stroop Reaction Time 123.12 103.02 308 .06 .08 __
Toddler Outcomes
4. Effortful Attention 2.01 0.59 320 −.10 .20*** −.04 __
5. Delay of Gratification 2.08 0.92 321 −.05 −.04 −.03 .03 __
6. Language Development 54.76 21.41 314 −.03 .10 −.00 .33*** .19** __
Child Negative Emotionality
7. 9 Months 3.13 0.76 350 .00 −.02 −.06 .10 .02 −.03 __
8. 18 Months 3.42 0.69 339 −.05 −.02 .02 −.01 −.01 −.00 .47*** __
9. 27 Months 3.63 0.70 316 −.01 −.06 −.13* −.02 −.08 −.17** .44*** .60*** __
Covariates
10. Openness in Adoption 4.73 1.18 361 .02 .20*** −.01 .17** .02 .24*** .08 .03 −.03 __
11. Child Sex (Girl) .43 .50 361 .02 −.07 −.03 .20*** .16** .06 −.05 .01 .09 −.08

Note.

*

p < .05;

**

p < .01;

***

<.001.