Marquis, Robyn & Flynn, Robert. (2009). The SDQ as a mental health measurement tool in a Canadian sample of looked-after young people†. Vulnerable Children and Youth Studies. 4. 114-121. 10.1080/17450120902887392.
This study compared the Strengths and Difficulties Questionnaire (SDQ) scores, based on ratings by foster parents or other caregivers, of 492 young people aged 11–15 years and living in out-of-home care in Ontario, Canada