Table 3: Evidence for efficacy depends on regulatory status.
(a)

All studies Registered herbal medicinal product
YesNo

Evidence for efficacy
 Yes15 1
 No0 2

= number of studies, (Chi2-test).
(b)

Subset of confirmatory studies Registered herbal medicinal product
YesNo

Evidence for efficacy
 Yes50
 No02

= number of studies, (Chi2-test).
Registered = holding a marketing authorization.