"direct causality of" is correct and usable in written English.
You can use it when you want to refer to a direct connection between two events, wherein one event causes the other to happen. For example, "The direct causality of the drought was seen in the fall in crop production."
Although this is a prospective study of risk factors for falls, the direct causality of falls cannot be identified using this epidemiological approach.
Although our current preclinical knowledge strengthens this hypothesis, the direct causality of NR2F6 and incidence of human autoimmune disease remains yet to be demonstrated (Table 2).
First, we have identified innate immune-related gene expression changes due to ARF loss; yet direct causality of these changes in macrophage infiltration into regressing tumors has not been established.
Incomparable numbers of people died as direct causalities of war.
Finally, while internationally all of the global attention is focused on the direct causalities of SARS, serious quality of care concerns resulting from people's behavioral changes due to their fears of SARS should not be overlooked.
While it is very difficult to assign a direct causality to the benign effect of scenarios, Trevor Manuel, the Minister of Finance in South Africa and a Mont-Fleur participant, credited the process with playing a significant role in the country's economic and political transition.
Part of the difficulty lies in the application of the concept of direct causality before selecting all the causal variables of interest for a specific patient.
Additional support for this notion is provided by the demonstration of a direct causality link between overexpression of cell cycle mediators and neuronal death.
Johnson and Cloonan avoid claims of direct causality, but they refuse to rule out links between violence in music — in terms both of lyrical content and of raw decibel impact — and violence in society.
This resolution proved short enough to provide the player with the feeling of direct causality between gesture and sound, similar to that for an acoustical instrument.
Most studies on the relationship between technological innovations and renewable energy consumption have focused on the role of technological innovations in the link between energy consumption and economic growth, with no deep analysis of direct causality between renewable energy and technological innovation.
