How does socioeconomic status affect the incidence of hospital-treated poisonings? A retrospective study

Background: Hospital-treated poisonings have a good outcome in general. The role of regional differences and socioeconomic status has been established in intensive care admissions and various causes of death, but not yet in hospital-treated poisonings. We set out to determine whether the incidence of hospital-treated poisonings is affected by the annual income of the residential area. Methods: All poisonings in Northern Ostrobothnia region of Finland treated in Oulu University Hospital during 2013-2016 were studied. Oulu University Hospital is the primary hospital in the area. Postal code areas of the county were categorized on the basis of their median annual net income as low-, middle- and high-income areas. Results: A total of 2142 poisoning cases were studied. The number of individual patients was 1525. In the low-income areas, the crude incidence of poisonings was more than 2-fold when compared with the middle- and high-income areas. In adolescents aged 13 to 17 years, the incidence in the low-income areas was almost 3-fold compared with the other two categories at 335/100 000/year (95% CI, 236-463). Four patients (0.2%) died during the hospital stay and 50 patients (2.3%) died within 6 months from the last admission. Conclusions: The incidence of hospital-treated poisoning was at least 2-fold in low-income areas when compared with middle- or high-income areas. For adolescent population from 13 to 17 years, the incidence in low-income areas was almost 3-fold when compared with other areas.