The phrase "a substantial proportion was" is correct and usable in written English.
It can be used when discussing a significant part or percentage of a whole in various contexts, such as research findings or statistical analysis.
Example: "In the survey, a substantial proportion was in favor of the new policy changes."
Alternatives: "a significant portion was" or "a considerable amount was".
In addition, a substantial proportion was offered treatment with carbamazepine, flunarizine, antidepressants or alternative treatments.
Results indicated that even among the youngest children in our sample a substantial proportion was capable of perceiving physical symptoms as a signal of anxiety.
This study indicates that among children born in the slums, a substantial proportion was born at home or with the assistance of a TBA.
Most of the study patients were of working age; a substantial proportion was unemployed and had a household income equivalent of lower than US$ 1000.
9 Furthermore, the only way that vertebroplasty could have a large benefit for a proportion of patients would be if the condition of a substantial proportion was made worse a scenario that is not reflected in the available data.
Of those participants who had self-reported diagnosis of diabetes without evidence on the use of antihyperglycemic medications (33.4% of incident cases), a substantial proportion was confirmed by a repeat OGTT or by antihyperglycemic medication at the subsequent phase, leaving only 23.6% of all incident diabetes cases unconfirmed.
Some portion of this land-use change is probably attributable to agricultural intensification on formerly swidden agriculture lands; however, a substantial proportion is from new forest loss.
Data controllers accumulate more and more data on people, of which a substantial proportion are personally identifiable and hence sensitive data.
Men between the ages of 21 and 30 are most likely to be targeted, but a "substantial proportion" are aged 11 to 20 and there have been victims as old as 82.
The contention that contemporary Bengali Muslims are all descended from lower-caste Hindus who had converted to Islam, then, is clearly incorrect; a substantial proportion are descendants of Muslims who reached the subcontinent from elsewhere.
Results: A total of 30 and 102 proteins showed significant deregulation between normal pancreas when compared with chronic pancreatitis and pancreatic adenocarcinoma, respectively, and although a substantial proportion were found similarly dysregulated in both chronic pancreatitis and pancreatic adenocarcinoma, several proteins were identified as potential disease-specific markers.
