The phrase "ascertain reasons" is correct and usable in written English.
It is a verb phrase that means to investigate or discover the reasons for something. For example, "The researcher tried to ascertain reasons why there were discrepancies in the data."
A survey, designed to ascertain reasons behind the choice of malaria prophylaxis, compliance and side effects, and to gather data on acquired malaria, identified a cluster of Plasmodium vivax infection in a cohort of 33 who travelled to Ethiopia on a scientific expedition.
We were unable to ascertain reasons for the reduction.
They were interviewed to ascertain reasons for PE.
More research is needed to ascertain reasons for these observed inequalities.
Qualitative analysis of group discussions were used to ascertain reasons for or against selecting benefits.
Therefore in this paper, a combination of a survey and qualitative study aimed to ascertain reasons why patients with chronic kidney disease (CKD) use HDS.
Similar to other studies [ 2, 5, 9], the most commonly ascertained reason for transfusion was anemia.
There is extensive literature analyzing the explanations for the governance option taken by local governments, aiming to ascertain the reasons why the management of certain services is externalized.
By evaluating non-bonding interaction energies between the inhibitor and the mutant enzymes, we have carried out a mechanistic analysis to ascertain the reasons underlying the decrease in binding affinities.
The Department of Social Welfare has to ascertain the reasons for (a) leaving the industry, (b) the reluctance of people to go into this industry, and (c) the disinclination of child care operators to register their centres.
All patients failing to attend the follow-up visits were called by telephone within three months from the start of the detoxification programme in order to ascertain their reasons for not adhering to the treatment programme.
