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Objectives: We aimed to explore the association between various physiological factors and pyelonephritis in parous women. Methods: Swedish nationwide registers were used to identify 1,073,467 parous women aged 15-50 years. The study period began in 1997 and ended in 2018, or at the first incidence of pyelonephritis, death, or emigration. Cox proportional hazards methods were used to determine haza
