The phrase "although the frequency of" is correct and usable in written English.
It can be used to introduce a contrast or exception regarding the frequency of an event or occurrence in a sentence.
Example: "Although the frequency of meetings has increased, attendance remains low."
Alternatives: "even though the rate of" or "despite the occurrence of".
The results show that although the frequency of perch use was low, (2.6%±0.15), significant preferences were clear.
Although the frequency of anti-Jewish incidents is said to have abated somewhat in the past year (thanks in part to more vigilant policing), many French Jews remain frightened, angry and dispirited.
US Airways tried to reassure customers, saying that it planned to keep serving almost all its destinations, although the frequency of flights on many routes will be curtailed and some flights will be rerouted through different hubs.
Although the frequency of the laser can be stabilized and measured to within 20 40 kilohertz, the determination of molecular parameters is limited to the accuracy inherent in the measurement of the electric field namely, one part in 104.
And the government statistics did not break down bystander death numbers by year, so it was not possible to analyze the effects of Mr. Obama's 2013 changes, although the frequency of such airstrikes has dropped.
Although the frequency of such acts has ebbed and flowed for years, experts who track extremist activity regard the recent surge as a potentially ominous upping of the ante.
Although the frequency of transpsoas lumbar interbody fusion procedures has increased in recent years, complication reports remain scarce in the literature.
Although the frequency of correct positioning declines in parallel with cortical development, in mature recipients correct homing is more frequent through the unusual path.
Although the frequency of swallowing was slightly higher, the volume of milk consumed per swallow was almost half the amount consumed by the comparison group (P <.01).
Although the frequency of this peak coincides with the eigenperiod of the seismometer, they are not related.
Although the frequency of hepatic encephalopathy and/or aberrant behavior episodes decreased, the symptoms still presented occasionally.
