Current pesticide suicide surveillance methods used across the African continent: a scoping review

Suicide poses a significant global health challenge in low- and middle-income countries and is a leading cause of death worldwide. Although global suicide rates have decreased by 36% between 2000 and 2019, the decline in Africa has not been as substantial. Suicide surveillance data, particularly from pesticide ingestion, is lacking.

This scoping review aimed to identify pesticide suicide surveillance methods currently used in African countries and to assess their viability for improving reporting of pesticide suicide deaths.

A scoping review was conducted using a five-stage methodological framework across several databases.

Peer-reviewed articles published in English that investigated (a) pesticide poisoning and (b) suicide in humans only and specific to the African continent.

MEDLINE (via PubMed), Scopus (with substantial Embase content), Web of Science Core Collection, Biological Abstracts, SciELO (on Web of Science platform), Academic Search Premier, Africa-Wide Information, Biological and Agricultural Index, CINAHL, Health Source Nursing/Academic, APA PsycInfo and General Science (EBSCOhost platform). The search was performed in January 2022, and the review of the results took place from February to May 2022.

All authors developed and tested the data extraction tool. The charting framework remained dynamic, continuously updated as reviewers gained a deeper understanding of the studies included. Four independent reviewers charted the data to ensure inter-rater reliability. To address discrepancies, a sample of eligible articles was cross-rated by the reviewers.

We identified 110 relevant studies describing eight different surveillance systems, conducted in 30 different African countries. Of these studies, 50.1% (56/110) reported on the number of pesticide suicides (totalling 1554); however, 49% (54/110) did not differentiate the cause of death further than either a poisoning death or a suicide, making it difficult to determine if pesticides were involved in the death or if the death was an intentional poisoning case. The surveillance systems identified included health facility records (hospital admissions data), poison control centre (PCC) data, forensic/mortuary data (including police reports), media reports, surveys/interviews with patient/family, case reports, systematic/literature reviews and civil registration and vital statistics (CRVS) data. Hospital admissions data was the most frequently used surveillance system (61/110, 55.5%).

The number of studies and surveillance methods found was higher than anticipated. While this is a positive sign, several areas of improvement were identified for pesticide suicide surveillance in Africa. These included improving reporting of the specific pesticides (including the active ingredient) linked to suicide cases for improving policy (since this is required for pesticide regulation) and making use of more than one surveillance system to enhance surveillance of pesticide suicides, allowing for under-used sources, such as PCCs, to be used more effectively in pesticide suicide surveillance. Finally, although a comparison of these surveillance methods outside of Africa was not directly possible for each surveillance system due to a lack of similar high-quality reviews, we did refer to publications where similar pesticide suicide surveillance systems were discussed.