Table 2.

Percentage of variance of significant effects in analyses of variance of mean problem scores

Variable	Informant	Informant*gender	Informant*age	Informant*age*gender
Total	9.6***	—	—	—
Internalizing	9.3***	< 1*	—	—
Externalizing	5.1***	< 1	< 1**	< 1**

Effect size according to Cohen’s (1977) standards [41]: for 1–5.9% of variance are small; 5.9-13.8% are medium, and above 13.8% are large. Less than 1% are indicated < 1.

*P < 0.05, **P < 0.01, ***P < 0.001.

— Non-significant effect.