You are viewing the site in preview mode

Skip to main content

Advertisement

Table 2 Results of final logistic regression model for influenza, Ontario, Canada, 2011/12 and 2012/13

From: Predictors of influenza among older adults in the emergency department

Predictorsa Unadjusted OR (95 % CI)   Adjusted OR(95 % CI)  
  n = 1313 p-value n = 1313 p-value
Presenting symptoms
Cough (self-report and/or chart) 12.4 (6.3, 24.6) <.001 6.4 (3.2, 13.0) <.001
Wheeze (chart) 3.7 (2.4, 5.7) <.001 2.1 (1.3, 3.3) .003
Any one or more of: sore throat, runny/stuffy nose, or sneezing 3.5 (2.4, 5.1) <.001  
Feverishness and/or triage temperature ≥37.2 °C 4.8 (3.2, 7.1) <.001 3.0 (2.0, 4.7) <.001
Number of systemic symptom(s) 1.5 (1.3, 1.7) <.001  
Confused (self-report and/or chart) 1.6 (1.1, 2.3) .02  
Time to ED from symptom onset (2–5 days) 3.1 (2.2, 4.5) <.001 2.2 (1.5, 3.2) <.001
Medical history
Influenza vaccine, current season 1.1 (0.8, 1.6) .59  
Antibiotics prescribed/taken prior to visit 1.9 (1.3, 2.8) .001  
General symptom relief medications prior to visit 2.4 (1.5, 4.0) <.001  
Frail (≥5 on Clinical Frailty Score) 0.78 (0.52, 1.2) .24  
Other factors
Age, per 10 year increaseǁ 1. 1 (0.9, 1.3) .51 1.2 (1.0, 1.5) .03
Children (<16 years) in household 1.4 (0.8, 2.4) .21  
Recent transportation use 1.1 (0.7, 1.8) .58  
Exposed to person with ILI ≤7 days before onset 2.5 (1.7, 3.5) <.001 1.9 (1.3, 2.8) .002
Material deprivation indexb 1.2 (1.1, 1.4) .002  
Caucasian/White 0.67 (0.46, 0.98) .04  
Enrolled week when ≥10 % of influenza tests positive 7.7 (1.9, 31.3) .005 5.1 (1.2, 21.7) .03
  1. OR Odds ratio, CI Confidence interval, ED emergency department, ILI influenza-like illness
  2. aParticipants with missing data on included predictors were excluded from the analysis. The proportion of participants with missing data for any given predictor did not exceed 3 %
  3. bMaterial deprivation index ranks from 1 (most privileged neighborhood) to 5 quintiles (most deprived neighborhood). The index is modeled as a continuous variable with one unit increase equivalent to an increase in quintile
  4. Adjusted model also includes hospital site
  5. Symptoms were based on self-reported data unless indicated otherwise
  6. Systemic symptoms were headache, myalgia, chills, weakness, fatigue, and loss of appetite. Predictor modeled as a continuous variable with one unit increase per addition of one symptom
  7. Reference group: 0–1 days and >5 days for time to ED from symptom onset
  8. ǁAge was modeled as a continuous variable per 10 years increase