Hospital admissions for acute anaphylaxis: time trend study

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Abstract
The hospital episode statistics database captures information on every admission to NHS hospitals in England. One primary diagnosis code and up to six secondary codes are recorded, the latter providing information on aetiology. We looked at hospital discharges occurring between 1 April 1991 and 31 March 1995 in which the primary ICD-9 (international classification of diseases, ninth revision) code was anaphylaxis (either anaphylactic shock (ICD-9 code 995.0) or anaphylactic shock due to serum (999.4)) together with a recorded aetiology. Data were analysed with the χ2 test for linear trends over time.
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