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  • Asthma Care Practices in Chicago-Area Emergency Departments: Statistical Analysis

Statistical Analysis
The analyses consist of descriptive statistics examining variations in asthma care practices. The distributions of responses are reported as means with SE or medians with interquartile ranges. Additional analyses were conducted to determine relationships between the following subgroups: (1) urban vs suburban location (those EDs with Chicago vs non-Chicago zip codes); (2) academic vs nonacademic hospital affiliation; and (3) those EDs that reported use of asthma care guidelines vs those that did not use them. Hospitals were classified as academic if they met the following criteria as outlined in the 1995 American Hospital Association Guide: (1) approval to participate in residency training by the Accreditation Council for Graduate Medical Education; (2) medical school affiliation reported to the American Medical Association; and (3) member of the Council of Teaching Hospitals of the Association of American Medical Colleges. www.canadian-familypharmacy.com

Comparisons were accomplished via nonparametric tests of analysis of variance or Wilcoxon rank sum tests. All analyses were conducted using computer software (SAS, version 6.12; SAS Institute; Cary, NC). For the purpose of this report, the term very few is used to describe responses corresponding to < 20% of patients, minority refers to 20 to 49%, majority refers to 50 to 79%, and nearly all refers to 80 to 100%.
This study was conducted under the approval of the Rush-Presbyterian-St. Luke’s Medical Center Institutional Review Board.
General information

Of the 89 EDs in the sample, 64 returned completed surveys, for a response rate of 71.9%. There were no statistically significant differences between the respondents and the nonrespondents with regard to urban vs suburban location or academic vs nonacademic status. Of note, the EDs that responded to this survey were located in hospitals with more total annual discharges than the EDs that did not respond, (13,600 vs 9,400 annual discharges; p < 0.05).

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