OG12 SC 134 对原文本身不理解，求教

hdczpf

134. Recently implemented "shift-work equations" based on studies of the human sleep cycle have reduced sickness, sleeping on the job, fatigue among shift workers, and have raised production efficiency in various industries.
(A) fatigue among shift workers, and have raised
(B) fatigue among shift workers, and raised
(C) and fatigue among shift workers while raising
(D) lowered fatigue among shift workers, and raised
(E) and fatigue among shift workers was lowered while raising
正确选项是C这个没有疑问，但是 Recently implemented "shift-work equations" based on studies of the human sleep cycle have reduced sickness
这个Based on studies的成分不大理解，有Adj+Noun+过去式状语做定语的表达吗？

cleotina

这里是定语，修饰“shift-work equations”