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

Table 3 Crude^a and adjusted^b ORs for visiting a health service, by severity indicator

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)

^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

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