The phrase "are a substantial cause" is correct and usable in written English.
It can be used when discussing factors or reasons that significantly contribute to a particular outcome or situation.
Example: "The recent changes in policy are a substantial cause of the increase in productivity among employees."
Alternatives: "are a significant factor" or "are a major contributor."
The court also finds that the state's actions are a substantial cause of this constitutional violation.
The Trade Agenda also asserts that the Trump Administration will rely on Section 201 of the Trade Act of 1974, which permits the imposition of "safeguards" (i.e., tariffs or quotas on imports) when the U.S. International Trade Commission finds that increasing imports are a substantial cause of serious injury to domestic industry.
Gunshot injuries are a substantial cause of vascular damage in the civilian population worldwide.
Accidental falls among inpatients are a substantial cause of hospital injury.
Adverse drug reactions (ADR) are a substantial cause of hospital admissions.
Injuries resulting from road traffic crashes are a substantial cause of disability and death worldwide.
Lawyers for the bereaved threatened a judicial review, saying it was only necessary to prove management negligence was "a substantial cause".
L. 98 120, § 3(a)(1), substituted "contributed importantly to such total or partial separation, or threat thereof, and to such decline" for "were a substantial cause of such total or partial separation, or threat thereof, and of such decline".
Background: Enteric adenoviruses, i.e. adenovirus 40 (and0) adenovirusirus 41 (Ad41), have been shown to be a substantial cause of pediatric gastroenteritis in various parts of the world, but no data are available for Iran.
When enough of them moved out, or fell on hard times, it was a substantial cause of a series of municipal bankruptcies – as a result of which a number of Californian cities are no longer able to pay the pensions of former state employees.
