TABLE 4.

Multigroup analyses for children’s biological sex and age.

	χ2	p	χ2diff
Children’s biological sex (Boys vs. Girls)
Model 1: Baseline, Parameter Freely Estimated	χ2(134) = 185.88	<0.01
Model 2: Invariant, Structural Parameter Constrained Equal	χ2(139) = 187.98	<0.01
			χ2diff (5) = 2.10; p = 0.83
Children’s age (6–10 y.o. vs. 11–13 y.o.)
Model 1: Baseline, Parameter Freely Estimated	χ2(134) = 169.55	<0.01
Model 2: Invariant, Structural Parameter Constrained Equal	χ2(139) = 179.32	<0.01
			χ2diff (5) = 9.77; p = 0.08
Geographical area (Northern Italy vs. Rest of Italy)
Model 1: Baseline, Parameter Freely Estimated	χ2(134) = 172.56	<0.01
Model 2: Invariant, Structural Parameter Constrained Equal	χ2(139) = 182.53	<0.01
			χ2diff (5) = 9.97; p = 0.08