Effectiveness of Low to Moderate Physical Exercise Training on the Level of Low-Density Lipoproteins: A Systematic Review

Table 2

Level of evidences.

Question studies asked	Level of evidence (Step)	Explanation of the level
Does the intervention help?	Level 1	Systematic review of randomized trials or n-of-1 trials
	Level 2	Randomized trial or observational study with dramatic effect
	Level 3	Non-randomized controlled cohort/follow-up Study
	Level 4	Case-series, case-control studies, or historically controlled studies
	Level 5	Mechanism-based reasoning