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Precipitation and Primary Health Care Visits for Gastrointestinal Illness in Gothenburg, Sweden

Artikel i vetenskaplig tidskrift
Författare A. Tornevi
Lars Barregård
B. Forsberg
Publicerad i Plos One
Volym 10
Nummer/häfte 5
ISSN 1932-6203
Publiceringsår 2015
Publicerad vid Institutionen för medicin, avdelningen för samhällsmedicin och folkhälsa, enheten för arbets-och miljömedicin
Språk en
Länkar dx.doi.org/10.1371/journal.pone.012...
Ämnesord DRINKING-WATER TURBIDITY, UNITED-STATES, EXTREME PRECIPITATION, PHILADELPHIA, ASSOCIATION, OUTBREAKS, DISEASES, RAINFALL, MODELS,
Ämneskategorier Epidemiologi

Sammanfattning

Background The river Gota Alv is a source of freshwater for the City of Gothenburg, Sweden, and we recently identified a clear influence of upstream precipitation on concentrations of indicator bacteria in the river water, as well as an association with the daily number of phone calls to the nurse advice line related to acute gastrointestinal illnesses (AGI calls). This study aimed to examine visits to primary health-care centers owing to similar symptoms (AGI visits) in the same area, to explore associations with precipitation, and to compare variability in AGI visits and AGI calls. We obtained data covering six years (2007-2012) of daily AGI visits and studied their association with prior precipitation (0-28 days) using a distributed lag nonlinear Poisson regression model, adjusting for seasonal patterns and covariates. In addition, we studied the effects of prolonged wet and dry weather on AGI visits. We analyzed lagged short-term relations between AGI visits and AGI calls, and we studied differences in their seasonal patterns using a binomial regression model. The study period saw a total of 17,030 AGI visits, and the number of daily visits decreased on days when precipitation occurred. However, prolonged wet weather was associated with an elevated number of AGI visits. Differences in seasonality patterns were observed between AGI visits and AGI calls, as visits were relatively less frequent during winter and relatively more frequent in August, and only weak short-term relations were found. AGI visits and AGI calls seems to partly reflect different types of AGI illnesses, and the patients' choice of medical contact (in-person visits versus phone calls) appears to depend on current weather conditions. An association between prolonged wet weather and increased AGI visits supports the hypothesis that the drinking water is related to an increased risk of AGI illnesses.

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