The phrase "a number of abnormal" is correct and usable in written English.
It can be used when referring to multiple instances or occurrences of something that is considered abnormal or unusual.
Example: "The study revealed a number of abnormal results that warranted further investigation."
Alternatives: "several abnormal" or "various abnormal".
Those patients presented a number of abnormal psychological and psychiatric symptoms characterized by multiple self-abnormalities [Grimm et al., 2009; Northoff, 2007; Sumner et al., 2010].
The Australian Transport Safety Bureau's (ATSB) head of aviation safety, Ian Sangston, said "a number of abnormal engine indications" had appeared in the plane's second engine shortly after it took off.
Removal of the uterus is indicated in a number of abnormal situations, including the presence of a cancer or of a benign tumour of the type called myoma, or fibroid tumour, if the myoma is large or rapidly growing, causes excessive bleeding or discomfort, or seems to be breaking down.
Marijuana smoking is associated with a number of abnormal findings in the lungs of habitual smokers.
The predictive model forecasts the probability of a number of abnormal events occurring in the next time interval.
We identified a number of abnormal metabolites in the diabetic kidney, including groups of amino acids, carbohydrates, polyols, lyso-phospholipids, glucuronides and other unidentified metabolites.
There are a number of other abnormal hemoglobins.
These changes are associated with a number of local abnormal biochemical pathways related to the altered osteoblast metabolism.
These changes are associated with a number of local abnormal biochemical pathways related to the altered metabolism of osteoblasts and osteoclasts.
As the plaques grew in size, they tended to consist of a core surrounded by a corona and were associated with a large number of abnormal neurites.
Chronic myelogenous leukaemia (CML) is a progressive, malignant disease characterized by a large number of abnormal blood cells in the bone marrow and peripheral blood [1, 2].
