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Table 3 Subgroup Analysis of Patients Who Met the Influenza-like Illness definition [12] at Polyclinics, December 2007-February 2013

From: Patterns of medication use and factors associated with antibiotic use among adult fever patients at Singapore primary care clinics

Characteristics Unadjusted OR (95% CI) p value Adjusted OR (95% CI) p value
Age (years)a
 17–24 1 0.6777 1 0.9438
 25–34 0.77 (0.46–1.28) 0.84 (0.48–1.49)
 35–44 0.96 (0.55–1.70) 0.94 (0.50–1.77)
 45–54 0.89 (0.50–1.60) 0.79 (0.41–1.51)
 55–64 1.24 (0.69–2.25) 1.11 (0.56–2.17)
 65 and above 1.25 (0.55–2.87) 0.92 (0.37–2.34)
Gendera
 Female 1 0.0147 1 0.1394
 Male 0.64 (0.44–0.91) 0.72 (0.47–1.11)
Year of enrolmenta
 Dec 2007–2008 1 0.0021 1 0.0239
 2009 0.91 (0.29–2.84) 1.45 (0.42–4.94)
 2010 0.37 (0.13–1.12) 0.62 (0.19–1.97)
 2011 0.90 (0.31–2.64) 1.20 (0.39–3.71)
 2012-Feb 2013 0.56 (0.19–1.68) 0.68 (0.22–2.15)
Polyclinic enrolleda
 Polyclinic A 1 <0.0001 1 <0.0001
 Polyclinic B 0.22 (0.14–0.37) 0.24 (0.14–0.41)
 Polyclinic C 0.39 (0.2–0.77) 0.31 (0.14–0.67)
 Polyclinic D and Eb 0.76 (0.21–2.82) 0.61 (0.15–2.46)
Number of initial visit symptom persisting at first follow-up
 0 1 <0.0001 1 <0.0001
 1 1.68 (0.96–2.93) 1.42 (0.79–2.57)
 2 2.48 (1.38–4.45) 2.30 (1.23–4.30)
 3 6.55 (3.59–11.94) 5.12 (2.67–9.83)
 4 and above 2.37 (1.34–4.17) 2.28 (1.24–4.19)
WBC count at initial visit (cells/μL)
 Leukopenia (<4) 1.07 (0.57–2.04)   0.99 (0.49–2.01)  
 Normal range (4–11) 1 0.1440 1 0.0433
 Leukocytosis (>11) 1.61 (1.01–2.55)   1.97 (1.17–3.33)  
  1. OR odds ratio
  2. aVariables included a priori as covariates in the model
  3. bPolyclinic D and E were combined because of low number of patients (5 and 8 respectively)