"worsened quality" is a correct and usable phrase in written English.
It can be used when describing something that has decreased in standard or overall excellence. Example: "The new management's cost-cutting measures have led to a worsened quality of products on the market."
This trial found that it can greatly extend life among a group of patients who have no existing treatment options, without worsening quality of life.
And if there is any substance to rumours about the worsening quality of debts to which both Chase and J.P. Morgan are exposed, this merger will require a lot of luck.
It appears that depression and irritability (but not mania) worsen quality of life and functioning in this clinical population.
Despite improvements in surgical techniques, urinary incontinence (UI) is not uncommon after radical prostatectomy (RP), and it may dramatically worsen quality of life (QoL).
One of the most important phenomena, from the point of view of sustainable development of the countryside, is the worsening quality and diminishing quantity of water resources.
A decline in function can increase health care use, worsen quality of life, threaten independence, and increase the risk of mortality.
We observed a great mortality on 30 days and among survivors a worsen quality of life with more dependence in their Activities of Daily Living.
The diagrams show the combined effect of fertilization, i.e. decreased number of fertilized stands with worsening quality, and decreased effect of fertilization in those stands where fertilization is included in the optimal management schedule.
The problem with that scenario is that if blood sugar levels soar too high in later years they can cut life expectancy and also dramatically worsen quality of life.
Other strata also showed negative PDs, however estimates were similar with worsening quality.
