Table 4. Bivariate Correlations Between the Predictor Variables (Age, Family Income, and Physiological Reactions) and Memory (dfs Range from 68 to 92).

	Memory Proportion Scores
	Free-Recall	Total
Age	.42**	.62**
Family income	.23*	.33**
Fire-alarm scores
PEP difference	.12	.05
RSA difference	−.04	.01
Reactivity protocol scores
PEP reactivity index	.21	.09
RSA reactivity index	−.11	−.23*

^*p < .05.

^**p < .01.

Note: Family income was scored on an ordinal scale, with 1 = <$10000 and 8 = > $60000. PEP, pre-ejection period and RSA, respiratory sinus arrhythmia. For the PEP and RSA baseline and fire-alarm response scores, smaller values reflect greater absolute levels of responding. The PEP and RSA fire-alarm difference scores were computed by subtracting children's baseline scores from their fire-alarm response scores, with smaller values reflecting greater arousal in response to the fire alarm. For the reactivity indices, larger scores reflect greater reactivity or consistent arousal throughout the laboratory protocol.