The phrase "a previous study defining" is correct and usable in written English.
It can be used when referring to a study that has established or clarified a particular concept or term in a prior context.
Example: "In a previous study defining the parameters of social behavior, researchers found significant correlations between environmental factors and individual actions."
Alternatives: "an earlier study outlining" or "a prior study describing".
6 Based on a previous study defining OSA on the basis of daytime sleepiness and disordered breathing during sleep, which includes snoring, 30 we accounted for the frequency of self-reported or spouse-reported snoring as a marker of OSA risk, and the inclusion of snoring in the regression model did not change the associations.
We did not find an association between smoking and RLD, whereas a strong association between smoking and RA-ILD was found in a previous study defining RA-ILD by means of carbon monoxide transfer factor, FVC<80%pred and perfusion abnormality.
A previous study defined 'marked seasonality' as the occurrence of more than 75% of the annual malaria incidence in six months of the year [31].
A previous study defined a cluster of 20 genes regulated by this PKC1-mediated signaling pathway that were strongly induced by chemical perturbation of the cell wall with Congo red dye, by enzymatic treatment with Zymolyase, or by mutations in specific cell wall genes such as KRE6, GAS1, FKS1, MNN9 and KNR4 [ 9].
A previous study defined significant marijuana use as greater than 100 episodes [ 25] and another study investigated adolescent methamphetamine and cannabis users that had an average of 1099 lifetime cannabis doses and 579 (methamphetamine only) and 837 (methamphetamine and cannabis) doses [ 26].
Additionally, the previous study defined a critical region by determining the minimal overlapping deletion among a few individuals with the TS neurocognitive phenotype, assigned as a dichotomous trait.
Previous study defined methods to determine optimum windows for TFDs [38, 39] that can reduce cross terms.
According to a previous study, we defined qSOFA-positive or qSOFA-negative as a qSOFA score of ≥ 2 or < 2, respectively [3].
In a previous study we defined normal FC values for healthy subjects (aged >12 months) within 100 μg/gr of stools [ 16, 25].
In a previous study, we defined eight phenotypic incompatibility groups by using a full diallele crossing design between 21 individuals of B. neustriaca, which implies that the species has at least eight functional S-haplotypes (Leducq et al. 2010).
In a previous study, we defined the maximum tolerated dose of doxorubicin combined with ifosfamide, administered every 3 weeks and supported by haematopoietic growth factors (Leyvraz et al, 1998).
