The phrase "a worldwide study of" is correct and usable in written English.
You can use it when referring to research or analysis that encompasses a global perspective or involves participants from various countries.
Example: "The researchers conducted a worldwide study of climate change impacts on agriculture."
Alternatives: "an international study of" or "a global analysis of".
Kremer, B. et al. A Worldwide Study of the Huntington's Disease Mutation: The Sensitivity and Specificity of Measuring CAG Repeats.
Geneticist Svante Pääbo shares the results of a worldwide study of human DNA that shows that early humans mated with Neanderthals after we moved out of Africa.
In 1753 he organized a worldwide study of a transit of Venus (1761), the first such systematic study to be made.
Three years ago Dr. Rosalind Harding of Oxford University and others made a worldwide study of the MC1R gene by extracting it from blood samples and analyzing the sequence of DNA units in the gene.
Piotr Unierzyski, an associate professor at the University of Physical Education in Poznan, Poland, who has made a worldwide study of social trends in tennis, said that, anyway, it was no longer true that tennis was a middle-class sport.
A worldwide study of fossilised mammals has demonstrated beyond any doubt that it was the extinction of the dinosaur some 65 million years ago that was the key trigger leading to the explosive growth of the warm-blooded mammals.
The decline of wild bees and other pollinators may be an even more alarming threat to crop yields than the loss of honeybees, a worldwide study suggests, revealing the irreplaceable contribution of wild insects to global food production.
A worldwide study, published in May, of more than four thousand R. & D. teams found that gender-diverse teams were considerably better at driving "radical innovation".
A worldwide study about the quality of living in different countries published by Newsweek in August 2010 ranked the Croatian education system at 22nd, a position shared with Austria.
A worldwide study about the quality of living in different countries published by Newsweek in August 2010 ranked the Croatian education system at 22nd, to share the position with Austria.
A 1991 worldwide study of 9-year-olds found that Finnish students read best.
