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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)