"may increase mortality" is correct and usable in written English.
You can use it when you want to express the idea that some course of action could lead to a higher number of deaths. For example, "The new policy on air pollution standards may increase mortality rates in the city."
Household crowding may increase mortality risk because of its relation to increased transmission of diseases, such as respiratory and infectious diseases.
One theory about why P.T.S.D. may increase mortality risk is that heart patients may avoid taking medications so as not to be reminded of their condition.
Impaired leukocyte function in patients with serious infections may increase mortality.
The majority of patients undergoing thyroidectomy have an uncomplicated outcome, but common comorbidities may increase mortality and morbidity.
Evidence from Chile indicates that arsenic in drinking water may increase mortality from pulmonary tuberculosis (Smith et al. 2010).
The physiological state of the gall crabs declines the growth rates and may increase mortality due to feed reduction or reproduction diversion (Hartnoll, 2006).
Ha (2015) attributed this mostly to fragment edge-effects such as lowered humidity, higher temperatures, and increased light and wind – i.e. effects which may increase mortality of sensitive trees and seedlings, and simplify the vegetation by promoting generalist species (Laurance 1997; Benitez-Malvido and Martínez-Ramos 2003; Bennet and Saunders 2010; Cochard 2011).
Vitamin A and E supplements not only provide no health benefits for generally healthy individuals, but they may increase mortality, though the two large studies that support this conclusion included smokers for whom it was already known that beta-carotene supplements can be harmful.
Resultant delays in achieving a correct diagnosis and appropriate management may increase mortality from other potentially fatal or debilitating infections.
Clinical signs were noted as early as 436 dpi in our study and exposure to temperature changes, disease and nutrient availability may increase mortality due to secondary causes, predation, accident, and exposure.
Huge fluid expansion may increase mortality.
