Chiropractic care for paediatric and adolescent Attention-Deficit/Hyperactivity Disorder: A systematic review

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Published online 2010 Jun 2. doi: 10.1186/1746-1340-18-13

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Table 2

National Health and Medical Research Council (NHMRC) levels of evidence

Level	Intervention Studies
I	Systematic review of level II studies
II	Randomised controlled trial
III-I	Pseudo-randomised controlled trial (i.e. alternate allocation or some other method)
III-2	Comparative study with concurrent controls:
	•Non-random, experimental trial
	•Cohort study
	•Case-control study
	•Interrupted time series with a control group
III-3	Comparative study without concurrent controls:
	•Historical control study
	•Two or more single arm study
	•Interrupted time series without a parallel control group
IV	Case series with either post-test or pre-test/post-test outcomes

NB. Adapted from NHMRC Levels of evidence [58]