Table 2.

Correlation between age at diagnosis of autism spectrum disorders and sociodemographic variables

Variables	Age at diagnosis of autism spectrum disorders
	N	Type of coefficient	Correlation correlation	P-value
Maternal age at delivery	120	Pearson’s	−0.224	0.014
Maternal education	120	Spearman’s	−0.180	0.050
Paternal age at delivery	117	Pearson’s	−0.283	0.002
Paternal education	116	Spearman’s	−0.286	0.002
Family socioeconomic status	120	Spearman’s	−0.082	0.371

Abbreviation: N, number of cases in the correlation.