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Table 3 Incidence of ARIs and diarrhoea according to age groups

From: Incidence of clinical malaria, acute respiratory illness, and diarrhoea in children in southern Malawi: a prospective cohort study

Condition Age groups in months Cases Total child-years at risk Incidence rate: cases per child-years at risk (95% CI) IRR (95% CI)
Diarrhoea 6.0–59.0 47 235.7 0.2 (0.2–0.3)  
6.0–11.9 5 44.9 0.1 (0.05–0.3) Reference
12.0–23.9 22 77.9 0.3 (0.2–0.4) 3.0 (1.1–7.9)
24.0–59.0 20 112.8 0.2 (0.1–0.3) 2.0 (0.8–5.3)
Upper Respiratory Tract Infection (URTI) 6.0–59.0 66 235.7 0.3 (0.2–0.3)  
6.0–11.9 5 44.9 0.1 (0.05–0.3) Reference
12.0–23.9 25 77.9 0.3 (0.2–0.4) 3.0 (1.2–7.8)
24.0–59.0 36 112.8 0.3 (0.2–0.4) 3.0 (1.2–7.6)
Pneumonia 6.0–59.0 65 235.7 0.3 (0.2–0.3)  
6.0–11.9 5 44.9 0.1 (0.05–0.3) Reference
12.0–23.9 28 77.9 0.4 (0.3–0.5) 4.0 (1.5–10.4)
24.0–59.0 32 112.8 0.3 (0.2–0.4) 3.0 (1.2–7.7)