"studies worldwide" is correct and usable in written English.
You can use it in a sentence to describe a variety of research or investigations done on a global scale, for example: Academic studies worldwide have shown that climate change is real.
Studies worldwide show men tend to think they're smarter than women.
Studies worldwide also show that older populations are less likely to be entrepreneurial and so may create fewer new jobs.
The association between high temperature and mental disease has been the focus of several studies worldwide.
This conclusion is borne out by careful field studies worldwide in which the rate of soil horizon formation is determined.
An examination of scientific studies worldwide has found no convincing evidence that vaccines cause autism, according to a committee of experts appointed by the Institute of Medicine.
On the subject of vaccines with mercury, five epidemiological studies worldwide show there is no evidence of a link with autism.
Our results imply that current studies worldwide represent a phylogenetically-conserved sample of fragmentation effects on plant-antagonist interactions.
Many studies worldwide have investigated the potential benefits achievable by transforming brown roofs of buildings to green roofs.
Furthermore, studies worldwide show that most M sufferers will have also TTH, at some point in their lives.
The dried plants, plucked and pressed by collectors as long ago as the 1830s, should aid biodiversity studies worldwide.
It is a very sensitive tool for picking up these changes at very early stages of hypoventilation, and its detection accuracy is heavily supported by numerous studies worldwide.
