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. Author manuscript; available in PMC: 2011 Apr 1.

Published in final edited form as: Infant Behav Dev. 2010 Feb 26;33(2):219–234. doi: 10.1016/j.infbeh.2009.10.007

Table 3.

Associations among study variables in preterm infants.

	1	2	3	4	5	6	7	8	9	10	11	12	13	14
1. Gestational Age	—
2. Birthweight	.79^**	—
3. Baseline Heart Rate	−.05	−.10	—
4. Δ HR 1 (Demonstration – Baseline)	.10	.05	−.60^**	—
5. Δ HR 2 (Immediate – Baseline)	−.01	−.04	−.53^**	.66^**	—
6. Δ HR 3 (Delay – Baseline)	−.03	.03	−.40^*	.19	.29^*	—
7. Baseline Vagal Tone	−.01	.15	−.29^**	.11	.02	.24^*	—
8. Δ V_NA 1 (Demonstration – Baseline)	−.19^†	−.23^*	.25^*	−.19^†	−.17	−.09	−.36^**	—
9. Δ V_NA 2 (Immediate – Baseline)	−.12	−.17	.43^**	−.42^**	−.48^**	−.17	−32^**	.45^**	—
10. Δ V_NA 3 (Delay – Baseline)	−.15	−.11	−.15	.04	.05	−.23^*	−.47^**	.33^**	.51^**	—
11. Baseline Cortisol	−.02	.01	.24^*	−23^*	−.20^†	−.25^*	−.09	.02	.09	.03	—
12. Δ Cortisol (time 2 – time 1)	.05	.07	−.14	.13	.14	.11	.01	.06	−.04	.11	−.44^**	—
13. Memory—Immediate	.13	.14	.03	.09	.07	.07	−.07	−.19^†	−.12	−.18	−.08	.02	—
14. Memory—Delay	.20^*	.14	−.03	.21^†	.06	.22^†	−.05	−.03	−.10	−.25^*	−.05	.04	.42^**	—

^†

p<.10

^*

p<.05

^**

p<.01