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

From: Prevalence of malaria in Woreta town, Amhara region, Northwest Ethiopia over eight years

Malaria cases
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  
  1. CI confidence interval, OR Odds ratio; < 5 and < 15 indicated study subjects who were less than 5 and 15 years of ages in both sexes, respectively, > 15 indicated those study subjects who were above 15 years of ages