Table 2.

Descriptive Statistics.

Variable	N	Mean	SD	SE	Median	Min	Max	Range	Skewness	Kurtosis
Age months	20	39.8	4.21	0.94	40	31	49	18	−0.2	−0.12
Laughs groups	20	8.2	8.14	1.82	6.25	0	27	27	0.75	−0.53
Laughs pairs	20	7.6	6.68	1.49	7.25	0	21	21	0.49	−0.96
Laughs indiv	20	0.92	2.36	0.53	0	0	10.5	10.5	3.33	10.62
Smiles groups	20	11.85	7.61	1.7	10.5	2	27.5	25.5	0.6	−0.9
Smiles pairs	20	11.38	7.45	1.66	9.75	2	28	26	0.71	−0.26
Smiles indiv	20	4.1	4.61	1.03	2.75	0.5	18	17.5	1.76	2.1