The phrase "are a substantial proportion" is correct and usable in written English.
It can be used when discussing the significance or size of a particular group or element within a larger context.
Example: "In our survey, respondents who identified as environmentally conscious are a substantial proportion of the total participants."
Alternatives: "make up a significant portion" or "constitute a considerable share."
When competition is close and labour costs are a substantial proportion of total costs, all employers selling in a given product market have a strong inducement to negotiate only through an employers' association that embraces them all.
Still, there are a substantial proportion of patients who fail to mobilize and collect adequate numbers of HSC and consequently cannot proceed to autologous stem cell transplantation.
First, there are a substantial proportion of complete FGC07 gene models that overlap but are not identical to gg2v3 models (54%).
There were three main findings in this study: (1) This multicenter, international study confirms previous evidence that never smokers are a substantial proportion of individuals with COPD and that they are usually not diagnosed with the disease.
Previous research has cited overuse of colonoscopy as a growing problem (37, 38, 39); however, our results demonstrate that there are a substantial proportion of patients who do not complete follow-up colonoscopy.
There are a substantial proportion of lesions that do not respond, and this may be because they are unrecognized as having mixed components even if biopsy is performed and patients who have one BCC are at risk of more.
"Not everyone is prone to frequent trading, but among those who feel that they must trade frequently to do well, there is a substantial proportion who are troubled by their behavior.
"In due course it will be a substantial proportion [of what Aviva paid] and the free money in that will be higher than under the Aviva deal," said Warner.
This uncertainty is a substantial proportion of the typical SOC concentrations in LNP landscapes (0.45 2.00%).
While for part of the adjacent vectors it holds that they are very similar (the pairs with a similarity close to one, represented by the points in the upper right-hand corner of the panels), it can be seen that there is a substantial proportion of adjacent state probability vectors that are almost orthogonal.
Without electricity, people cannot develop and there will always be a substantial proportion of the world's population living in poverty.
