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. Author manuscript; available in PMC: 2010 Mar 19.
Published in final edited form as: Ann Emerg Med. 2008 Sep 27;53(3):310–320. doi: 10.1016/j.annemergmed.2008.07.018

Table 5.

Zero-Inflated Poisson Regression To Analyze The Association Between Recurrent ED visits for chest pain using study year and 12 month characteristics

Characteristics IRR CI
Demographic
Gender (Male)*** 0.12 (0.06, 0.27)
Age** 1.06 (1.02, 1.10)
Race (African-American) 0.61 (0.30, 1.21)
Education (High School grad or more) 1.10 (0.59, 2.03)
Substance use frequency ++
 Total Days binge drinking 1.00 (0.98, 1.01)
 Total Days using crack/cocaine 1.01 (0.99, 1.02)
Cardiac risk profile*** 0.36 (0.21, 0.60)
SF-36 Physical Health Functioning Index 1.00 (0.99, 1.01)
Have a primary medical doctor? (yes)*** 0.09 (0.04, 0.20)
Have Health Insurance? (yes)*** 9.43 (2.44, 36.50)
*

p< 0.05

**

p<0.01

***

p<0.001

IRR: Incidence rate ratio

++

summary variables of use over the study year from 3, 6, 12 month survey

Example of clinical interpretation of model in regard to repeat visits for chest pain: males have 0.12 times less recurrent ED visits than females. Those participants who have health insurance have 9.43 times more ED visits for chest pain than those who do not have health insurance.