The phrase "as to the proportion of" is correct and usable in written English.
It can be used when discussing or specifying the ratio or percentage of something in relation to another element or factor.
Example: "The study focused on the impact of various factors as to the proportion of participants who reported positive outcomes."
Alternatives: "regarding the ratio of" or "concerning the percentage of".
The landscape in a 78-ha circular area around the GPS coordinates was classified using the CORINE Land Cover Map of Spain (http://www.idee.es) as to the proportion of each of the following cover types: urban, crops/semi-natural grasslands, and primarily woody vegetation.
There is some controversy as to the proportion of patients who recover well following ankle fractures [ 21].
As to the proportion of patients with reimbursement, the figure for Union Hospital was only 36%, while for other three clinics it was more than 60%.
The conjugated products of steroid metabolism find their way into the circulation after peripheral action and provide evidence as to the proportion of the precursor pools of steroids utilized as androgen or estrogen.
As patients could be admitted to either a haematological or bone marrow transplant (BMT) wards, a weighted average cost was taken between the two wards, based on the advice of the expert panel as to the proportion of febrile neutropenic patients that would be seen in each ward.
However, the results of studies in humans and mice have been inconsistent, generating considerable controversy as to the proportions of Bacteroides and Firmicutes and their relationship to obesity.
We carried out an adjusted assay, in which patient plasma was systematically diluted to an identical total IgG concentration (200 µg/ml) before testing, so as to determine the proportion of total IgG accounted for autoantibodies.
The magnitude of over diagnosis of malaria was estimated by comparing the proportion of outpatient attendees of all ages clinically diagnosed as malaria to the proportion of attendees having a positive malaria rapid diagnostic test over a two month period.
The number of DEG present in the high-expressed class was low but in significantly higher proportion as compared to the proportion of total unigenes present in this category.
The proportion of articles in small animal and equine journals was associated with gross national income, research and development, and % urban population, as opposed to the proportion of food animal articles, agricultural output, and % rural population.
Then, assuming that there is variation in N in the population, natural selection can operate so as to increase the proportion of Os with N — and hence also those with characteristic C — in the population.
