Gut microbiota and autism spectrum disorders: where do we stand?

Table 3 Top ten productive funding agencies in research related to gut microbiota and autism spectrum disorders from 2003 to 2022

Ranking ^a	Funding agency	Country	No. of documents	%
1st	National Natural Science Foundation of China	China	76	7.93
2nd	National Institutes of Health	USA	63	6.58
3rd	National Institute of General Medical Sciences	USA	23	2.40
4th	National Institute of Mental Health	USA	20	2.09
5th	Autism Research Institute	USA	19	1.98
5th	National Institute of Allergy and Infectious Diseases	USA	19	1.98
7th	National Institute of Diabetes and Digestive and Kidney Diseases	USA	16	1.67
7th	National Research Foundation of Korea	South Korea	16	1.67
9th	Natural Sciences and Engineering Research Council of Canada	Canada	13	1.36
9th	Science Foundation Ireland	Ireland	13	1.36

^a Gap is left in the next ranking number when funding agencies are given the same number
^b The variance between the 23.90% mentioned in the text and the sum of 29.02% in Table 3 can be attributed to overlapping research productivity among funding agencies. In several instances, the same research projects may have received financial support from multiple funding agencies, resulting in the same research output being attributed to multiple funding agencies

ISSN: 1757-4749