greg suffers from depression. His friend matthew also suffers from depression as well as conduct disorder. According to the theory of problem behavior syndrome, this means

It means Matthew probably had worse family experiences.

Explanation:

Theory of problem behavior syndrome deals with different factors such as environment and behavior being a determinant for an individual having problem behaviors or not. When such conditions are adverse he/she will have problem behavior syndrome.

Matthew suffers from depression as well as conduct disorder means he probably had worse family experiences.

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depends on what they need