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Volume 23, Number 11—November 2017

Research

Weather-Dependent Risk for Legionnaires’ Disease, United States

Jacob E. Simmering, Linnea A. Polgreen, Douglas B. Hornick, Daniel K. Sewell, and Philip M. PolgreenComments to Author 
Author affiliations: The University of Iowa, Iowa City, Iowa, USA

Main Article

Table 2

Demographic and severity characteristics among dropped and retained records in a study of weather-dependent risk for Legionnaires’ disease, United States, 1998–2011*

Characteristics Cases
Controls
Dropped, n = 2,153 Retained, n = 3,005 p value Dropped, n = 228,674 Retained, n = 189,412 p value
Mean age, y (± SD) 60.6 (15.7) 61.8 (15.6) 0.0078 68.2 (17.1) 68.8 (17.2) <0.0001
Female, % 39.6 39.1 0.7138 48.1 48.2 0.4170
Privately insured, % 39.0 38.8 0.8814 19.6 17.0 <0.0001
Not insured, % 11.2 7.7 <0.0001 6.2 4.5 <0.0001
Mean no. diagnoses (± SD) 9.6 (4.1) 9.6 (4.3) 0.9213 8.2 (3.9) 9.4 (4.3) <0.0001
Mean no. procedures (± SD)† 1.9 (2.5) 1.9 (2.8) 0.6027 1.0 (1.8) 1.4 (2.2) <0.0001

*Many of the significant differences in the controls resulted from the large sample and might not be clinically significant. The analysis comprised data from 26 states: Arizona, Arkansas, California, Colorado, Connecticut, Illinois, Iowa, Kentucky, Maryland, Massachusetts, Mississippi, Missouri, Montana, Nevada, New Hampshire, New Jersey, New York, North Carolina, Oregon, Pennsylvania, Rhode Island, Utah, Vermont, Virginia, Washington, Wisconsin.
†Any type of procedure recorded in the Agency for Healthcare Research and Quality’s Healthcare Cost and Utilization Project; this was a measure of severity, and this variable was not included in the model.

Main Article

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