Systematic reviews are widely used in medicine as a method of decision making based on evidences. The systematic review is a method of locating and evaluation of a synthesising evidence. Meta-analysis refers to quantitative synthesis of the results of clinical trials or other primary studdis. Simple introductory account about meta-analysis is given. We describe two examples of meta-analysis application and strengths and weaknesses of this research method.
meta-analysis, systematic review, clinical trials, evidence based medicine.