Table 2

Indications evaluated by multiple systematic reviews (SRs)

Direction of results
ConditionNo of SRs+±Overall effectsComments
Breast cancer2002Both SRs are of high quality
Old age3210+Positive SR is of poor quality
Rheumatoid arthritis2002Cochrane review is negative
Improving aerobic capacity2101±Positive SR is of poor quality
Cardiovascular disease and risk factors2101±Contradiction exists in interpretation
Lowering blood pressure3210±Positive SRs are of poor quality
Osteoporosis or bone mineral density2011±Positive SR included more trials that originate from China
Psychological health5510+Methodological quality is variable
Fall prevention4310+All of the included SRs are of high quality
Improving balance2110+Newer SR is more positive
  • +, positive conclusion; ±, conclusion neither positive nor negative; –, negative conclusion.