. Author manuscript; available in PMC: 2014 Dec 1.

Published in final edited form as: Infant Behav Dev. 2013 Aug 1;36(4):10.1016/j.infbeh.2013.06.002. doi: 10.1016/j.infbeh.2013.06.002

Table 1.

Means, Standard Deviations and Sex Differences of Study Variables

	Total M(SD)	Boys M(SD)	Girls M(SD)	T
18 -month
Observed anger	1.76(.53)	1.77(.53)	1.75(.53)	.37
Maternal sensitivity	2.52(.61)	2.45(.62)	2.60(.59)	−1.83^†
Expressive language	22.69(18.36)	21.55 (19.23)	24.12( 17.19)	−1.10
Family SES	−.01(.85)	.07 (.79)	−.10 (.91)	1.51
30 –month
Observed anger	1.11(.24)	1.11(.23)	1.10(.25)	.46
Maternal sensitivity	2.83(.52)	2.77(.55)	2.90 (.47)	−1.87^†
Expressive language	72.88(22.90)	69.26(24.87)	77.35(19.41)	−2.64^**

Notes.

^†

p <.10,

^**

p < .01,; n range was 113 to 136 for boys and 94 to 110 for girls.