Table 2.

Ordinary Least Squares Regressions: Season of Birth as Related to ADHD Symptoms in the Early Forties (N=548).

Independent Variables	ADHD Symptoms Beta (t-statistic)
Winter (December – March)	0.08 (0.98)
Spring (April – May)	0.34 (3.59)***
Autumn (September – November)	0.17 (2.07)*
R2	0.04

Note:

^*p<0.05;

^***p<0.001;

Born in the summer (June – August) was treated as a reference;

Gender, age, parental educational level, T2 household income, and county of origin were statistically controlled.