The phrase "a stringent reference" is correct and usable in written English.
It can be used when describing a reference that is strict, precise, or demanding in its requirements or standards.
Example: "The study was conducted under a stringent reference to ensure the accuracy and reliability of the results."
Alternatives: "a strict reference" or "a rigorous reference".
Use of a more stringent reference group did not increase the smoking risk ratios in part because of the limited number of women who had no active or passive smoke exposure and the lack of an association between secondhand smoking and breast cancer in this sample.
Further, in none of the studies reviewed, in either the peer-reviewed literature or the JMPR database, was it evident that the human data contributed to a lower (more stringent) reference value than that based on animal data; rather, the converse was true - human data, if they influenced a reference value at all, led to a relaxation of the value.
Over the years, more stringent reference levels of 150 Bq m−3 or less have been proposed by international institutions and national agencies.
However, the magnitude of this risk was modest (OR = 1.43) and decreased rather than increased with use of more stringent reference groups excluding those exposed to secondhand smoke.
Firstly, we have not undertaken any independent verification of the accuracy of injury diagnoses within SHR although we have shown that our estimates for cruciate ligament injury are quite consistent with studies using more stringent reference standards [ 24].
In Weining, Qingzhen, and Leigong, average exposures remained below provisional tolerable weekly intakes for total mercury and for methylmercury (0.57 μg/kg/d and 0.23 μg/kg/d, respectively) and a more stringent methylmercury reference dose of 0.1 μg/kg/d.
We further divided euthyroid type 2 diabetic patients into two subgroups (TSH: 2.0 to <4.0 vs. 0.4 to <2.0 μIU/ml) and compared the two based on a more stringent "normal" reference interval of TSH suggested by the National Health and Nutrition Examination Survey NHANESS) III (7).
The lower estimated SNP frequency can be attributed to the low coverage of 5Mg sequences on reference assemblies and a stringent filtering criterion.
These authors compared the trees reconstructed from individual genes by evaluating the proportion of genes that shows strong statistical support for a tree differing from a reference tree at a stringent 95% confidence level.
These short reads can then be mapped to a reference genome by a stringent DNA sequence alignment algorithm such as ELAND (Illumina Inc ., MAQ [ 8], or Bowtie [ 9] (mapping).
