Table 1.

Sample Characteristics

	Low Negative Emotionality			High Negative Emotionality
Variable	N	Mean(SD)	Range	N	Mean(SD)	Range	Comparison
Maternal Education (in years)	531	14.78(2.40)	7 to 21	232	14.54(2.50)	7 to 21	t(761) = 1.22
Maternal Depressive Symptoms (24 mos)	494	9.27(8.31)	0 to 42	217	9.15(8.52)	0 to 50	t(709) = .17
Attachment Security (24 months)	521	.30(.21)	−.49 to .73	229	.29(.20)	−.42 to .71	t(748) = .67
Sleep Problems (24 months)	516	3.05(2.64)	0 to 13	228	3.13(2.70)	0 to 14	t(742) = −.38
Internalizing Problems (24 months)	516	7.52(4.51)	0 to 23	228	8.30(5.32)	0 to 29	t(742) =−2.06*
Externalizing Problems (24 months)	516	13.84(6.79)	0 to 37	228	14.63(7.45)	0 to 42	t(742) =−1.42
Sleep Problems (36 months)	518	3.58(2.62)	0 to 12	228	3.80(2.59)	0 to 13	t (744) =−1.12
Internalizing Problems (54 months)	531	6.88(7.22)	0 to 46	232	7.16(6.91)	0 to 42	t (761) = −.49
Externalizing Problems (54 months)	531	10.07(11.65)	0 to 61	232	10.06(12.22)	0 to 67	t (761) = .01

^*p < .05