The phrase "as we previously concluded" is correct and usable in written English.
You can use it when referring back to a conclusion that has already been established in prior discussion or analysis.
Example: "As we previously concluded, the data supports our hypothesis regarding the effectiveness of the new treatment."
Alternatives: "as we determined earlier" or "as we established before".
On the basis of a lack of conservation of AS between species, we previously concluded that AS does not frequently serve as a mechanism that enables the production of multiple functional proteins from a single gene.
We previously concluded that depressive symptoms were more common in women with impaired glucose metabolism.
We previously concluded from an RA study that the strength of association between clinical and ultrasound measures diminishes as patients are in or close to remission [ 15].
As we have previously concluded, however, those regulations themselves do not dictate the decision to discharge or transfer in a particular case.
As we have previously concluded, to increase antenna area is an effective way for absorption frequency modulation, but it is limited by the size of the support layer and it becomes more severe for 25 μm × 25 μm pixel.
Furthermore, the correlations with the amount of SWS support the notion that implicit memory representations are modulated by the deeper sleep stages, as previously concluded from behavioral data [26].
This work was initially prompted by a report that EBER expression in BL cells confers resistance to IFN-α-induced apoptosis [7], but that in our hands this was not mediated through inhibition of the dsRNA-activated protein kinase (PKR) [8], as had been previously concluded [7].
The Berkeley Earth (BEST) project basically backed up established temperature records from Nasa and others; the world is indeed warming, and by about as much as we previously thought, it concluded.
We have previously concluded that PDT is a high-risk procedure [ 2].
As previously concluded by these authors, we can see that both observers have considerably better repeatability than the machine and that the observer performance is almost identical.
