The phrase "a decline in frequency" is correct and usable in written English.
It can be used when discussing a reduction in how often something occurs or is observed.
Example: "There has been a noticeable decline in frequency of customer complaints over the past few months."
Alternatives: "a decrease in occurrence" or "a reduction in frequency."
During the course of an episode, rehydration, medication and care-seeking also showed a decline in frequency after the first or second week.
A 2014 state study tied the decline to seven factors, including predators, whose numbers have swelled because of a "decline in frequency of severe winters".
Patients suffering from chronic migraine experienced a decline in frequency and severity of migraines after systemic treatment with autologous SVF isolated with the ultrasonic cavitation protocol from Bright et al. [ 138].
Children living in homes with lead service lines showed a decline in frequency of elevated blood lead over time at the same rate as children in homes without lead service lines.
The highest frequency of alpha-synuclein deposits was found in biopsies of the back with 11 cases (seven when using one section only), while there were six cases in the proximal leg, four in the distal leg and five in the finger, suggesting a decline in frequency from proximal to distal sites.
There has been a sharp increase in the frequency of esophageal adenocarcinoma and a decline in the frequency of squamous cell carcinoma.
This indicates that, in untreated mild AD patients, a decline in peak frequency from baseline can be observed at a group level in the course of 6 months, and peak frequency is sensitive enough to pick up an intervention effect in this patient group.
On an optimistic note, we have seen a decline in the frequency of severe hypertension.
There is the long-term decline in union density and a decline in the frequency of industrial action.
The IPCC in 2007 predicted that there was "likely to be a decline in the frequency of cold air outbreaks... in [northern hemisphere] winter in most areas". 7) A few points on Antarctic sea ice.
