Meta-analyses of studies comparing 3 months of prednisolone to 6 months of prednisolone do not reveal a benefit of prolonged treatment duration. (A) All four available studies (B) Two fully published studies. In both analyses, numbers of FRNS of the current study correspond with numbers of strict FRNS. Analyses were performed with Review Manager (RevMan) version 5.1 for Windows (The Nordic Cochrane Centre, The Cochrane Collaboration, Copenhagen, Denmark, 2011).