Table 2 Exclusion and inclusion criteria for assessment of eligibility

Inclusion

• papers giving the number of UAPP per well-defined population and time span

• published 2006–2018

Exclusion

• papers not explicitly stating results on UAPP

• papers exclusively reporting on suicidal poisoning/intentional self-harm

• studies on long-term effects such as cancer that did not include UAPP

• studies on poisoning treatments or clinical outcomes

• modelling or simulation or biochemical studies

• ill-defined survey populations or hospital data with unclear catchment area

• language other than English, German, Spanish

• data prior to 2006