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Table 3 Crudea and adjustedb ORs for visiting a health service, by severity indicator

From: Disease severity determines health-seeking behaviour amongst individuals with influenza-like illness in an internet-based cohort

Severity Indicator Crude ORs (95% CI)a Fully-adjusted ORs (95% CI) Likelihood Ratio Test P-value for fully-adjusted model
Symptoms
 ARI 1 1 <0.0001
 ILI-No Fever 2.72 (2.12–3.48) 1.58 (1.11–2.25)  
 ILI-Fever 6.34 (4.82–8.35) 2.52 (1.67–3.80)  
 ILI-Fever, with phlegm 17.82 (12.95–24.51) 5.99 (3.75–9.56)  
Duration (days)
 0–3 1 1 <0.0001
 4–7 2.35 (1.92–2.86) 2.18 (1.63–2.91)  
 8–14 3.59 (2.82–4.56) 4.03 (2.81–5.79)  
  ≥ 15 6.99 (5.22–9.36) 4.62 (3.03–7.03)  
Health-score decrease (%)
 0–10 1 1 <0.0001
 10.1–20 1.46 (1.00–2.11) 1.56 (1.00–2.43)  
 20.1–30 2.58 (1.76–3.79) 2.49 (1.56–3.97)  
 30.1–50 5.32 (3.70–7.65) 3.73 (2.39–5.81)  
  ≥ 50.1 14.38 (9.45–21.88) 5.54 (3.41–8.99)  
  1. aThe crude ORs include all four years of data. Due to the inclusion of health-score, for which data was not collected in the 2011–12 season, the fully-adjusted model excludes 2011–12. Crude analyses excluding 2011–12 showed similar results to the crude analyses presented here (Additional file 6: Table S3). bAdjusted for all other severity indicators and confounders