The phrase "a previous study observed" is correct and usable in written English.
It can be used when referencing findings or conclusions from an earlier research study in academic or scientific writing.
Example: "A previous study observed a significant correlation between sleep quality and academic performance."
Alternatives: "an earlier study noted" or "a prior study found".
A previous study observed that RUNX2 is important in the development and migration of plasmacytoid dendritic cells48, which can be recruited to RA synovial tissue49.
A previous study observed α-synuclein in colon tissue prior to onset of PD29, which might explicate constipation prior to motor symptoms.
A previous study observed the bipolar disorder prevalence to be 0.43% in Sivas province [33].
In agreement with our findings, a previous study observed that G-Rh2 induced Fas oligomerization in HeLa cells (Yi et al., 2009).
A previous study observed depression in 10-40% of the migraine patients and mood disorders in 13.6% of the patients [30].
Indeed a previous study observed that these drugs can drive another form of synaptic change in the VTA [13].
This idea is supported by a previous study observing that the risk of breast cancer for women with nonproliferative disease was greater among postmenopausal women [ 9].
Open defecation is highly prevalent, with a previous study observing that 59.9% of the households do not have latrines and those with latrines often do not use them [ 19].
Therefore, we first analyzed 10 stable and 10 unstable atherosclerotic plaques from a previous study observing increased expression of miR-216a in unstable compared with stable plaques (n=10 per group); we next, investigated whether the miR-216a increase is associated with inhibition of autophagy during atherogenesis in vivo.
No previous study observed a protective effect for C1.
Our previous study observed an elevated level of inflammatory chemokine CCL-4 in the blood from old individuals (Chiu et al., 2006).
