All 3 Uses

vary
in
Hiroshima, by John Hersey
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The lot of Drs Fujii, Kanda, and Machii right after the explosion — and, as these three were typical, that of the majority of the physicians and surgeons of Hiroshima — with their offices and hospitals destroyed, their equipment scattered, their own bodies incapacitated in varying degrees, explained why so many citizens Who were hurt went untended and why so many Who might have lived died.†
Chpt 2

varying = differing; or changing
The duration of the disease varied depending on the patient's constitution and the amount of radiation he had received.†
Chpt 4 *

varied = differed; or changed
Some of them measured the force that had been necessary to shift marble gravestones in the cemeteries, to knock over twenty-two of the forty-seven railroad cars in the yards at Hiroshima station, to lift and move the concrete roadway on one of the bridges, and to perform other noteworthy acts of strength, and concluded that the pressure exerted by the explosion varied from 5.3 to 8.0 tons per square yard.†
Chpt 4

Definitions:

(1) (vary)
to be different, or to change

Vary is often used to describe small differences or changes--especially about things of the same type. It would be more common to say "The weight of full-grown elephants varies depending upon diet and other factors," than to say "The weight of elephants varies from that of mice."
(2) (meaning too rare to warrant focus)