Pooled analyses of single-event ICH incidence for lifetime, children and young adults younger than age 25 years, and neonates. The diamond represents the pooled estimate. (A) Pooled single-event ICH incidence rates per 1000 person-years for lifetime cohorts. The results from the prospective follow-up from Zanon et al (2012)¹⁹ were used in this analysis instead of the results from retrospective and prospective follow-up. (B) Pooled single-event ICH incidence rates per 1000 person-years for children and young adults younger than 25 years of age. The study by Traivaree et al (2007)²³ was excluded from the analysis because of overlap in the catchment area and population with the study by Revel-Vilk et al (2004)¹⁶, which had a longer follow-up period. The study by Kulkarni et al (2017)²⁵ was excluded from the analysis because it concerned a specific cohort of infants <2 years of age. The studies by Andersson et al (2017)³, Hu et al (2018),²³ and Poonnoose et al (2017)⁶⁹ did not include neonatal ICH. (C) Pooled single-event ICH cumulative incidence per 100 live births for neonates.