The phrase "a frequent form" is correct and usable in written English.
It can be used to describe something that occurs often or is commonly seen in a particular context.
Example: "In modern literature, a frequent form of expression is the use of stream-of-consciousness narration."
Alternatives: "a common type" or "a regular pattern".
The ICHD subdivides episodic tension-type headache into an infrequent form i.e., <1 day per month on average (<12 days per year), and a frequent form i.e., ≥ and <15 days/month for at least 3 months.
Headache was highlighted as the third cause of disability worldwide and migraine is a frequent form of headache disorders causing remarkable disability during the headache attacks along with substantial social and financial burden to the patient as well as to the society [1, 2].
Delirium is a frequent form of acute brain dysfunction in critically ill patients.
Among the PD-causing genes, mutations in LRRK2 are a frequent form of inherited PD.
Delirium is a frequent form of psychopathology in elderly hospitalized patients; it is a symptom of acute somatic illness.
Ovarian cancer, a frequent form of gynecological malignancy, is the sixth most common cause of cancer deaths in women.
A less frequent form (with <500 triplets) seems to be associated with LOFA, and a more frequent (>500 triplets) with cFA.
In this regard, in a retrospective study conducted on diabetic patients, the use of metformin has been found significantly associated with reduction of pain symptoms in patients affected by lumbar radiculopathy, a very frequent form of chronic pain syndrome [ 80, 81].
It had a sequence matching the most frequent form of INR 64 nt upstream of the start codon (TCATTCT, p=7×10-5), followed after 2 nt by a weak match to FPR (AAATAGC, p=0.05).
Secondary peritonitis is the most frequent form of peritonitis, characterized by a high disease burden and a high mortality rate.
Human MTLE are the most frequent form of partial epilepsies and frequently display resistance to anti-epileptic drugs[18].
