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Mortality of emergency general surgery patients over time, stratified by age group a All age groups; b age 16–30 years; c age 31–45 years; d age 46–60 years; e age 61–75 years; f age over 75 years. Results of the linear regression analysis, including slope, 95 per cent c.i. and P values, are shown in Table S2 (supporting information).
