. Author manuscript; available in PMC: 2013 Jan 31.

Published in final edited form as: Infant Behav Dev. 2012 Jan 2;35(2):295–302. doi: 10.1016/j.infbeh.2011.12.002

Table 2.

Comparison of 4 months and 9 months Still Face Paradigm affect and maternal interaction scores

	4 months Mean (SD)	9 months Mean (SD)	t test	Correlations between 4 & 9 months
Play/Baseline Episode-Maternal Attention Seeking	.81 (.21)	.67 (.30)	t=2.106 p=.046	R=0.180 p=.389
Play/Baseline Episode-Maternal Contingent Responding	.15 (.20)	.31 (.31)	t=−2.373 p=.026	R=0.275 p=.183
Play/Baseline Episode-Percent Positive Affect	.15 (.20)	.26 (.27)	t=−1.862 p=.075	R=0.243 p=.241
Reunion/Play Episode-Maternal Attention Seeking	.69 (.26)	.61 (.31)	t=1.107 p=.279	R=0.192 p=.359
Reunion/Play Episode-Maternal Contingent Responding	.26 (.26)	.35 (.31)	t=−1.302 p=.205	R=0.198 p=.343
Reunion/Play Episode-Percent Positive Affect	.18 (.23)	.25 (.27)	t=−1.862 p=.075	R=0.356 p=.081
Stress Response	−.56 (.48)	−.89 (.75)	t=1.989 p=.058	R=0.137 p=.514

N= 25 children per group