• Roberto Forero, Mohammed Mohsin, Adrian E Bauman, Sue Ieraci, Lis Young, Hai N Phung, Kenneth M Hillman, Sally M McCarthy, and C David Hugelmeyer.
• Simpson Centre for Health Services Research, Liverpool Health Service, Liverpool, NSW, Australia. r.forero@unsw.edu.au
• Med. J. Aust. 2004 Jan 19; 180 (2): 67-70.

ObjectivesTo estimate the magnitude of access block and its trend over time in New South Wales hospitals, using different definitions of access block, and to explore its association with clinical and non-clinical factors.Design And SettingAn epidemiological study using the Emergency Department Information System datasets (1 January 1999 to 31 December 2001) from a sample of 55 NSW hospitals.Main Outcome MeasuresPrevalence of access block measured by four different definitions; strength of association between access block, type of hospital, year of presentation, mode and time of arrival, triage category (an indicator of urgency), age and sex.ResultsRates of access block (for all four definitions) increased between 1999 and 2001 by 1%-2% per year. There were increases across all regions of NSW, but urban regions in particular. Patients presenting to Principal Referral hospitals and those who arrived at night were more likely to experience access block. After adjusting for triage category and year of presentation, the mode of arrival, time of arrival, type of hospital, age and sex were significantly associated with access block.ConclusionsAccess block continues to increase across NSW, whatever the definition used. We recommend that hospitals in NSW and Australia move to the use of one standard definition of access block, as our study suggests there is no significant additional information emerging from the use of multiple definitions.

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