Evidence is insufficient because of: 1  The limited number or size of studies. 2  Important flaws in study design or methods. 3  Inconsistency of findings across individual studies. 4  Gaps in the chain of evidence. 5  Findings not generalizable to routine primary care practice. 6  Lack of information on important health outcomes.
Definition of jerk for English Language Learners. : 1  a stupid person or a person who is not well-liked or who treats other people badly. : 2  a quick pull or twist. : 3  a sudden sharp movement.
(plural jerks) 1  A sudden, often uncontrolled movement, especially of the body. 2  A quick, often unpleasant tug or shake. ( 3 US, slang, pejorative) A dull or stupid person. ( 4 US, slang, pejorative) A person with unlikable or obnoxious qualities and behavior, typically mean, self-centered, or disagreeable.