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Table 2 Risk factors associated with post-primary, opposed to primary, active dengue immune status

From: A serological framework to investigate acute primary and post-primary dengue cases reporting across the Philippines

Risk factor Post-primary
OR 95% CI p value
Age
 < 5 1   
 6–15 1.69 1.46–1.96 < 0.001
 16–30 1.80 1.53–2.11 < 0.001
 > 31 1.91 1.54–2.38 < 0.001
Sex
 Female 1   
 Male 0.94 0.85–1.04 0.248
Disease day
 1–2 1   
 3–4 1.06 0.94–1.19 0.377
 5 1.00 0.84–1.19 0.973
Clinical manifestation
 No warning signs 1   
 Warning signs 1.47 1.28–1.70 < 0.001
 Severe 1.66 1.28–2.16 < 0.001
 Non-disclosed 0.90 0.76–1.07 0.227
DRU elevation (metres)
 0–75 1   
 75–150 0.81 0.67–0.97 0.023
 150+ 0.61 0.52–0.72 < 0.001
DRU pop den (km2)
 0–100 1   
 100–200 0.87 0.77–0.97 0.017
 200+ 1.32 1.14–1.53 < 0.001
  1. OR unadjusted odds ratio, Pop den population density, DRU disease-reporting unit