ObjectiveTo introduce sensitivity and homogeneity tests in network meta-analysis and its implementation in R software. MethodsUsing an example, we performed sensitivity analysis by comparing the random effect model with the fixed effect model. Homogeneity analysis was performed using metaphor package and combinat package in R software. ResultsThe results of the two models were similar, and the data was steady. The results of homogeneity analysis showed that the confidential intervals in all loops were crossed over with blank value; and direct and indirect estimates of the effects in network meta-analysis were not significantly different, with good homogeneity. ConclusionNetwork meta-analysis is a kind of indirect comparison analysis method, and its sensitivity is especially important. The introduction of homogeneity makes network meta-analysis more accurate. Using R software for sensitivity and homogeneity analysis in network meta-analysis is a feasible method.
ObjectiveTo explore the main risk factors related to the incidence of epilepsy and the cause of epilepsy, so as to provide basis for decision making on epilepsy prevention. MethodsSuch databases as PubMed (1980 to 2013.1.2), EMbase (1980 to 2013.1.2) and CNKI (1987 to 2013.1.2) were electronically searched to collect case-control studies on risk factors for epilepsy. Meanwhile, relevant studies were also manually retrieved. Two reviewers independently screened studies according to the inclusion and exclusion criteria, extracted data, and assessed methodological quality. Then, meta-analysis was performed using RevMan 5.2 software. Results17 studies involving 6 641 participants (including 3 114 cases and 3 527 controls) were included. The results of meta-analysis showed that, family history of epilepsy, traumatic brain injury, febrile seizures, neonatal disease, and risk factors during pregnancy were associated with the incidence of epilepsy, with pooled OR (95%CI) values of 5.11 (3.19, 8.20), 4.14 (3.63, 4.73), 5.10 (2.64, 9.87), 3.33 (1.84, 6.05), and 3.23 (1.80, 5.78), respectively. ConclusionCurrently evidence shows that the risk factors influencing the incidence of epilepsy are family history of epilepsy, traumatic brain injury, febrile seizures, neonatal disease, and risk factors during pregnancy.