Table 6 Mixed effects model results for moderating effect of age across groups

Imitation (Pre-test)

1.879

0.658

2.857

0.004 **

0.590

3.168

Imitation (Difference)

4.895

0.662

7.396

< 0.001 ***

3.598

6.192

Age (Months)

0.208

0.424

0.490

0.624

-0.624

1.039

Imitation (Difference) * Age (Months)

0.245

0.067

3.627

< 0.001 ***

0.112

0.377

Group Variance

54.280

4.062

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