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.
twitch verb [I/T]. âº to make a âshort and âsudden âmovement, or to âcause âpart of âyour âbody to move âsuddenly: [I] She âsaw his âmouth twitch into a little âsmile that âdisappeared âalmost at âonce. twitch noun [C] us /twÉªtÊ/ âº She âsignalled with a twitch of her âfinger. noun [C] us /twÉªtÊ/.