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Volume 8, Number 8—August 2002


Use of Automated Ambulatory-Care Encounter Records for Detection of Acute Illness Clusters, Including Potential Bioterrorism Events

Ross Lazarus*†Comments to Author , Ken Kleinman‡§, Inna Dashevsky‡, Courtney Adams‡, Patricia Kludt¶, Alfred DeMaria¶, and Richard Platt*‡§
Author affiliations: *Brigham and Women’s Hospital, Harvard Medical School, Boston, Massachusetts, USA; †University of Sydney School of Public Health, Sydney, Australia; ‡Harvard Pilgrim Health Care and Harvard Vanguard Medical Associates, Boston, Massachusetts, USA; §CDC Eastern Massachusetts Prevention Epicenter and HMO Research Network Center for Education and Research in Therapeutics, Boston, Massachusetts, USA; ¶Massachusetts Department of Public Health, Boston, Massachusetts, USA;

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Table 3

Number of episodes of lower respiratory syndrome that would be expected to occur only once a month and once a year, based on a generalized linear mixed model (GLMM), in a representative eastern Massachusetts census tracta

Month Day of week No. needed for once per month event No. needed for once per year event
January Monday 5 6
January Tuesday 5 6
January Wednesday 5 6
January Thursday 5 6
January Friday 5 5
January Saturday 4 4
January Sunday 4 4
April Monday 4 5
April Tuesday 4 5
April Wednesday 4 5
April Thursday 4 5
April Friday 4 5
April Saturday 3 4
April Sunday 3 4
July Monday 4 5
July Tuesday 4 4
July Wednesday 4 4
July Thursday 4 4
July Friday 4 4
July Saturday 3 4
July Sunday 3 4
October Monday 5 6
October Tuesday 4 5
October Wednesday 4 5
October Thursday 4 5
October Friday 4 5
October Saturday 4 4
October Sunday 4 4

aThis census tract has 491 health plan members and a random effect of 0.083, illustrating the effect of day of week and month of year for 2002.

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