The impact of childhood diagnosed ADHD versus controls without ADHD diagnoses on later labour market attachment—a systematic review of longitudinal studies

Table 3 Quality ratings of included studies

Study	Clearly stated research question/objective	Clearly specified/defined population	Participation rate ≥ 50%	Population, inclusion/exclusion criteria	Sample size justification	Exposure measured prior to the outcome	Timeframe	Levels of exposure	Valid and reliable measurement of exposure	Assessment of exposure more than once	Valid and reliable measurement of outcome	Blinded outcome assessors	Loss to follow-up ≤ 20%	Measured and statistically adjustment of confounding	Rating
Roy et al. [16]	Yes	No	NR	No	No	Yes	Yes	No	Yes	No	Yes	No	NR	Yes	Fair
Owens et al. [13]	Yes	Yes	Yes	Yes	Yes	Yes	Yes	Yes	Yes	Yes	Yes	Yes	Yes	Yes	Good
Hechtman et al. [8]	Yes	No	NR	No	No	Yes	Yes	Yes	Yes	Yes	Yes	No	Yes	Yes	Fair
Biederman et al [3]	Yes	Yes	CD	Yes	No	Yes	Yes	NR	Yes	Yes	Yes	Yes	No	Yes	Fair
Mannuzza et al. [11]	CD	Yes	Yes	No	No	Yes	Yes	No	Yes	No	Yes	Yes	Yes	Yes	Fair