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Age-adjusted incidence ratios (IRs) for stroke or transient ischemic attack in periods following chickenpox, in children and adults. For each database, the central diamond and line correspond to the IR and 95% confidence interval, and the area of the gray square reflects the weight of the study. Abbreviations: CI, confidence interval; GPRD, General Practice Research Database; IR, incidence ratio; THIN, The Health Improvement Network.
