This is the fifth paper in the evidence-based medicine glossary series. In this paper, we mainly introduce the systematic error（bias）and random error in medical research, review the definition and classification of bias made by different institutions and individuals. We also identify and categorize more than 10 types of bias in systematic review, which are considered the best evidence in evidence-based medicine. Additionally, we introduce some methods to reduce and eliminate bias, explaine six subject headings related to bias in MeSH, and introduce a new glossary — uncertainty in metrology.
Objective We studied the change of psychological behavior and quality of life in children with epilepsy, to explore the treatment strategy to improve their psychological behavior and quality of life. Methods Collected forty children with epilepsy from Hebei General Hospital during March 2015 to October 2015 and 40 normal children in this study. "Epilepsy patients quality of life scale", "Daily life ability scale" and "Sense of uncertainty in hospitalized patients disease scale" test were performed to the participants. The difference of daily psychological behavior ability, sense of uncertainty in illness and quality of life between the two groups were analyzed. Results The epilepsy children’s daily life ability and the quality of life are lower than normal children (P<0.05), the disease uncertainty is higher than normal children (P<0.05). Conclusion The epilepsy children had serious psychological and behavior disorders and lower life quality. Some medical intervention should be taken to alleviate the psychological burden, improve the ability of daily life, reduce the uncertainty in illness, and comprehensively improve the quality of life of children with epilepsy.