Fig. 9From: Latitudinal differences on the global epidemiology of infantile spasms: systematic review and meta-analysisScatter plots of prevalence. Prevalence of infantile spasms abstracted from 18 studies [15, 19, 30, 54,55,56,57,58,59,60,61,62,63,64,65,66,67,68] are represented as circles proportional to sample size and arranged in scatter plots according to various covariates. 95% confidence intervals and line of regression are shown. a Global prevalence is plotted against latitude. b Global prevalence is categorized by GDP per capita (inflation-adjusted to 2016 USD). c Global prevalence plotted against time, defined here as the prevalence point, which ranged from 1975 to 2009. Corresponding univariate meta-regression analysis demonstrated no effect of time on prevalence globally (p = 0.17)Back to article page