Table 2.

Study 1 correlations among still-face smiling at 6 months, ESCS variables at 8, 10, and 12 months, and ASBI variables at 30 months.

Variable	SF Smiling	ASBI-Express	ASBI-Comply
8-Month ESCS measures
IJA	−0.23	−0.37	−0.22
AS	0.58**	0.43*	−0.03
RS	0.23	0.33	0.26
10-Month ESCS measures
IJA	−0.24	−0.16	−0.01
AS	0.50*	0.63**	0.31
RS	0.22	0.04	−0.11
12-Month ESCS measures
IJA	−0.06	0.06	−0.04
AS	0.16	0.16	0.13
RS	0.25	−0.15	−0.25

Note. n = 22; SF Smiling = proportion of time spent in still-face procedure that involved smiling; IJA = rate of initiating joint attention; AS = proportion of IJA episodes involving anticipatory smiles; RS = proportion of IJA episodes involving reactive smiles; ASBI-Express = social expressivity scores on the ASBI; ASBI-Comply = compliance scores on the ASBI.

^*p < 0.05.

^**p < 0.01.