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Incidence of appendicitis by age and sex, and complicated and uncomplicated appendicitis by age, among Swedish children, 2001–2014 a Incidence of appendicitis by age and sex. The adjusted incidence rate ratio, obtained from multivariable Poisson regression analysis, increased by 12·8 (95 per cent c.i. 12·6 to 13·0) per cent per added year of age (P < 0·001). b Incidence of complicated and uncomplicated appendicitis by age, and percentage of complicated appendicitis.
