Table 2 Case definition for ADHD

Inclusion Criteria

individual is 4 years old or older; and

individual’s medical record includes ICD9 code in one or more in-person visits, on separate calendar days; and

individual’s medical record includes one or more prescriptions of ADHD-related medications;

Or

individual is 4 years old or older; and

individual’s medical record includes a relevant ICD9 code (314) on two or more in-person visits, on separate calendar days

Exclusion Criteria

Individual’s medical record includes one or more ICD9 codes corresponding to an exclusionary medical condition (see Additional file 1).