Table 2 Distribution of malaria cases by age groups and species, Woreta town, northwest Ethiopia (2005–2012)

Age groups

Diagnosis

Positive (%)

Negative (%)

OR (95% CI)

p-value

< 5

P.falciparum

5097 (64.8)

18,901(71.4)

7.04 (2.46–2.89)

< 0.001

P.vivax

2501 (31.8)

7432 (28.1)

5.64 (4.57–6.96)

< 0.001

Mixed

264 (3.4)

139 (0.5)

1.00

Sub-total

7862 (100.0)

26,472 (100.0)

5–15

P.falciparum

12,194 (69.3)

26,065 (67.7)

2.32 (2.08–2.59)

< 0.001

P.vivax

4694 (26.7)

11,788 (30.6)

2.73 (2.44–3.05)

< 0.001

Mixed

704 (4.0)

647 (1.7)

1.00

Sub- total

17,592 (100.0)

38,500 (100.0)

> 15

P.falciparum

5983 (75.0)

12,057 (68.1)

1.61 (1.39–1.87)

< 0.001

P.vivax

1675 (21.9)

5260 (29.7)

2.51 (2.15–2.94)

< 0.001

Mixed

319 (3.1)

398 (2.2)

1.00

Sub- total

7977 (100.0)

17,715 (100.0)

Total

P.falciparum

23,274 (69.7)

57,023 (69.0)

2.66 (2.46–2.89)

< 0.001

P.vivax

8870 (26.5)

24,480 (29.6)

2.99 (2.76–3.26)

< 0.001

Mixed

1287 (3.8)

1184 (1.4)

1.00