Table 2.

Correlations among all study variables.

	1	2	3	4	5	6	7	8	9	10	11	12
1. Maternal education (years)	–
2. Infant age at 6-mo visit (days)	.29±	–
3. Prematurity status	−.14	.20	–
4. Third trimester CRP (mg/L)	.03	.14	.14	–
5. Third trimester IL-6 (pg/mL)	.15	.18	−.10	.28±	–
6. Third trimester TNF-α (pg/mL)	−.07	.07	−.17	.17	.81 * **	–
7. Infant cognitive ability (scaled score)	.08	−.02	−.30±	−.31±	−.51 * *	−.41 *	–
8. Infant negative affect (proportion score)	−.21	−.37 *	.00	.01	.11	.25	−.09	–
9. Infant night wakings (total wakings)	−.23	−.21	−.21	−.16	−.10	−.16	−.12	−.19	–
10. Infant longest sleep period (min)	.31±	.19	.05	.10	.01	.12	.26	−.03	−.80 * **	–
11. Infant nighttime sleep ratio (nighttime sleep to total sleep)	.30	−.02	−.16	−.04	.16	.37±	.04	.13	−.37 *	.49 * *	–
12. Child age at 4-yr visit (years)	.04	−.45 * *	−.19	−.22	.02	.43 *	−.16	.22	−.02	.14	.28	–
13. Child EF (proportion score)	.15	−.15	−.21	−.27	.12	.39 *	.22	.05	−.02	.08	.11	.43 *

Note. Prematurity status was defined as gestational age less than 37 weeks; CRP = C-reactive protein; IL-6 = interleukin 6; TNF- α = tumor necrosis factor-alpha; Infant cognitive ability was indexed using the BSID-III Cognitive Subscale Scaled Score; Negative affect indexed as the proportion of 5-second intervals with coded negative affect behavior during still-face episode; Min=minutes; EF = Executive Function

^±p < .10

^*p < .05

^**p < .01

^***p < .001.