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Table 2 Odds ratios with 95% confidence intervals, for being hospitalized with influenza in children with a risk condition during the influenza seasons in 2017–18 and 2018–19 in Norway

From: Risk conditions in children hospitalized with influenza in Norway, 2017–2019

Risk category Age groups (years)  
0–4 5–9 10–14 15–17 All ages
OR (95% CI) OR (95% CI) OR (95% CI) OR (95% CI) OR (95% CI)
Influenza season 2017–18
 Lung disease 3.0 (2.1–4.2) 4.5 (2.4–7.8) 2.6 (0.8–6.3) 5.8 (2.4–12.3) 4.0 (3.0–5.1)
 Asthma 2.4 (1.5–3.7) 2.7 (1.0–6.0) n.a. 6.3 (2.2–14.7) 2.9 (2.0–4.1)
 Heart conditions 6.2 (2.0–14.7) 30.6 (12.0–65.6) n.a. n.a. 7.6 (3.9–13.3)
 Neurological disease or sequelae 5.8 (2.5–11.5) 11.8 (5.5–22.5) 26.7 (14.0–47.8) 16.9 (7.3–34.6) 10.1 (7.2–13.9)
 Epilepsy 6.8 (2.2–16.1) 16.2 (7.2–32.0) 25.1 (11.5–49.4) 23.4 (9.6–49.6) 12.1 (8.2–17.3)
 Immunocompromised 11.4 (5.6–20.7) 44.5 (22.8–79.9) 35.1 (13.5–76.7) n.a. 18.3 (12.3–26.4)
 All patients with one or more risk condition 6.1 (5.0–7.4)
Influenza season 2018–19
 Lung disease 4.1 (3.0–5.6) 4.4. (1.9–9.0) n.a. n.a. 4.7 (3.5–6.1)
 Asthma 2.5 (1.6–3.9) n.a. n.a. n.a. 2.4 (1.5–3.7)
 Heart conditions n.a. n.a. n.a. n.a. n.a.
 Neurological disease or sequelae 11.0 (6.1–18.6) 17.6 (7.7–35.7) n.a. n.a. 7.0 (4.4–10.5)
 Epilepsy 16.9 (8.6–30.1) 23.8 (9.8–49.9) n.a. n.a. 9.2 (5.6–14.4)
 Immunocompromised 8.9 (4.0–17.1) 26.1 (8.2–64.1) n.a. 53.9 (16.0–144.6) 13.6 (8.1–21.6)
 All patients with one or more risk
condition
6.8 (5.4–8.4)
  1. n.a. = not applicable due to low numbers