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.
Princeton's WordNet(0.00 / 0 votes)Rate this definition: 1  tug, jerk(noun) a sudden abrupt pull. 2  tugboat, tug, towboat, tower(verb) a powerful small boat designed to pull or push larger ships. 3  tug(verb) pull hard. The prisoner tugged at the chains; This movie tugs at the heart strings.