The Presence of Asthma, the Use of Inhaled Steroids, and Parental Education Level Affect School Performance in Children

Table 3

Calculation of the communalities for each variable using PCA.

Variables	Asthmatic	Nonasthmatic
Maternal smoking	0.724	0.719
In utero smoking	0.725	0.718
Absence days	0.766
Days of continuous absence	0.826
Brothers/sisters	0.8	0.792
Birth order	0.845	0.791
Father education	0.853	0.788
Mother education	0.817	0.782
First school performance	0.8	0.784
Final school performance	0.89	0.877
Final grade elementary	0.857	0.804