Table 2: Chi-square test for parental psychiatric disorders and their familial relation among case and control groups.

GroupNumber (%)OR (95% CI) value

Related parentsADHD51 (24.6%)0.012
Control70 (35.4%)
Maternal psychiatric disorderADHD46 (22.2%)<0.0001
Control11 (5.6%)
Paternal psychiatric disorderADHD52 (25.2%)8.7 (0.71–106.3)<0.0001
Control19 (9.6%)