Table 4.

Correlations Between Dimensions of Mastery Questionnaire (DMQ) and Parenting Stress Index (PSI) at 6 and 18 Months of Age. (6-month DMQ as correlated with 6-Month PSI and 18-Month DMQ as Correlated With 18-month PSI.

		Parental distress	Parent-child difficult interaction	Difficult child	PSI total
Object-oriented persistence	6 month	−.09	−.18*	−.07	−.10
	18 month	−.06	−.28**	−.18*	−.23**
Social persistence with adults	6 month	.05	−.10	.04	.01
	18 month	−.15	−.26**	−.11	−.19*
Social persistence with children	6 month	−.12	−.18*	−.01	−.08
	18 month	−.29**	−.28**	−.16	−.27**
Gross motor persistence	6 month	.00	−.08	−.05	−.01
	18 month	−.07	−.21*	−.10	−.17*
Mastery pleasure	6 month	.01	−.17*	−.07	−.05
	18 month	−.23**	−.36**	−.21**	−.31**
Negative reaction to failure	6 month	.16	.14	.19*	.18*
	18 month	.17*	.21*	.32**	.26**
General competence	6 month	−.22*	−.28**	−.15	−.22**
	18 month	−.19*	−.37**	−.25**	−.30**

^*p<.05;

^**p<.01