“…Concerning the child-related factors, Velez et al (1989) reported that stressful life events are important risk factors for both internalizing and externalizing disorders. Low-level parental occupation (Campbell, 1995;Kalff et al, 2001a), family size (Williams et al, 1990), race (Costello et al, 1996), family structure (Velez et al, 1989), low maternal age at delivery (Orlebeke et al, 1998), and maternal depression (Lavigne et al, 1998) are important family-related risk factors. Although the environment in which a child grows up is a potential risk factor for behavioral problems (Kalff et al, 2001b), little is known about its influence on DSM-based diagnoses (Hermanns and Leu, 1998).…”