The Influences of Tai Chi on Balance Function and Exercise Capacity among Stroke Patients: A Meta-Analysis

Table 1

Evidence level and recommendations grades of the Oxford Center for Evidence-Based Medicine.

Level of evidence	Contents	Recommended hierarchy
Ia	Systematic review with homogeneity of RCTs	I
Ib	Individual RCTs (with narrow confidence interval)
IIa	Systematic reviews with homogeneity of cohort studies	II
IIb	Individual cohort study (including low-quality RCTs, e.g., <80% follow-up)
IIc	Outcomes research
IIIa	Systematic review of homogeneous case-control studies	III
IIIb	Individual case-control study
III	Case series (and poor-quality cohort and case-control studies)	IV
—	Expert opinions without explicit critical appraisal	V