The phrase "although estimated" is correct and usable in written English.
It can be used to introduce a contrast or qualification regarding an estimation or approximation in a statement.
Example: "The project's completion date is set for next month, although estimated timelines may vary based on unforeseen circumstances."
Alternatives: "even if approximated" or "despite being estimated".
Although estimated SO42− reduction rates are relatively high, significant decreases in NVDOC were not observed at the contaminated site.
We therefore concluded that, although estimated on a specific subset of motor solutions, the determinants of intention choice can be generalized over the entire distribution of movements predicting both correct and incorrect choices.
Although estimated energy subsidies are of similar magnitude in both sectors, removal of subsidies in the gas sector has a significantly larger effect on emissions reductions.
The detection of AFB in stained smears correctly identified only over half of the M. bovis-infected animals, although estimated specificity was surprisingly high (94.4%).
The prevalence of STIs among FSWs was typically higher than among women or men participating in community-based studies conducted in the general population (Figure 6), although estimated prevalences of chlamydia were comparable.
NPV, although estimated in a small sample, was 100%.
Two important causes of excess deaths during the winter are influenza and cold snaps, although estimating exactly how much can be attributed to each takes more time.
Although we estimated p0 below, this estimation required several assumptions.
Although an estimated 66,000 workers die each year from occupational disease, their employers are never prosecuted.
Although an estimated 175,000 work permits were issued last year, these were mainly for highly skilled workers.
They appeared to be healthy, although officials estimated that the temperature in the car was 110 degrees.
