The phrase "declined fourfold" is correct and usable in written English.
It can be used to describe a situation where something has decreased or diminished by a factor of four.
Example: "The company's profits declined fourfold over the last year due to increased competition."
Alternatives: "decreased by a factor of four" or "dropped four times".
Later, this miRNA expression declined significantly, nearly fourfold after post-cold storage at 24 h.
Patients were considered to be cured if their anti-phase I IgG antibody titre at least showed a fourfold decrease or had declined to < 1024 during subsequent serological testing, serum PCR had become and/or remained negative, and diagnostic imaging during follow-up showed no signs of active infection.
Facebook had a fourfold increase in marketing costs and its operating margin declined to 43percentt from 53percentt last year.
There were six cycling deaths in Portland in 2007, an unusually large number, though Mr. Geller and others say that with bicycle use up fourfold since the early 1990s, the rate of collisions has actually declined.
In Norway, the breast cancer incidence increased by 50% in the 1990s 13, during a period with a fourfold increase in HT use; however, the breast cancer incidence declined only marginally after 2002 10 122002 10 12
Kangaroo density in the post-fire community declined from the beginning of the experiment, while numbers in the post-mined revegetation increased fourfold within one year.
In a logistic regression analysis of non-receipt of prophylaxis, current IDU was associated with a more than fourfold increased odds of non-receipt compared with women with no IDU history; this declined to 2.75 increased odds after adjusting for confounding factors (Table 3).
While India's per capita gross domestic product grew fourfold between 1992 and 2006 (the last period for which there are accurate statistics), the percentage of children age 3 and under who are underweight declined only to 46percentt from 52 nationally, and actually increased in some states.
Lyft declined to disclose its ride numbers in Los Angeles, but said that over the past, year Lyft Line usage has grown more than fourfold.
The telomere-lengthening effect was not evident in the overall group of patients, despite an average loss of 71% of excess weight and a fourfold decline in the group's fasting insulin levels a year after surgery.
