The phrase "a previous study compared" is correct and usable in written English.
It can be used when referring to research that has been conducted before, particularly in academic or scientific contexts.
Example: "A previous study compared the effects of different diets on weight loss."
Alternatives: "an earlier study examined" or "a prior study analyzed".
A previous study compared eight different tibial tray designs, including six symmetric and two asymmetric designs.
A previous study compared intra-articularly administered bupivacaine and levobupivacaine to placebo and both were found to be more effective than placebo (Bengisun et al. 2010).
A previous study compared GST-L1 to a VLP multiplex immunoassay, which is biologically similar but technically different from our VLP-ELISA.
A previous study compared two mouse models of intestinal tumorigenesis, ApcR850X (Min) and Apc1322T 1322Tthe the latter a model of human codon 1309 changes.
A previous study compared morphology of one-year-old roach raised under experimental conditions in the presence and absence of pike (Esox) predators [ 45].
Second, a previous study compared 6 CXR scores [ 8] and found the modified Chrispin-Norman score to have good reproducibility and correlation with lung function.
We note the following observations that relate to these specific comparisons of NKX2-5 tArgets: A) Previous studies comparing DamID and ChIP-chip experiments performed in Drosophila reported "a high degree of overlap" (Negre et al., 2006, Moorman et al., 2006, Tolhuis et al., 2006, van Bemmel et al., 2010, Yin et al., 2011).
This is in agreement with a previous study comparing the microbiopsy technique with the traditional open biopsy technique in the vastus lateralis of the quadriceps femoris muscle [57].
Results from this study are consistent with the results from a previous study comparing silica-doped γ-Al2O3 samples to pure γ-Al2O3 samples.
In a previous study comparing MME-induced dento-skeletal changes on postero anterior cephalograms in pre-pubertal patients with those in an untreated control group [22], MME was found to be an effective treatment option for improving dento-skeletal transverse dimensions and correcting posterior crossbite.
In a previous study comparing both activity against bacteria and toxicity against tissue cells under the same and standardized conditions, we were able to demonstrate that copper ions exhibit a most favorable ratio between bactericidal activity and cell toxicity (Heidenau et al. 2005).
