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Table 4 Incidence of malaria infection stratified for age range

From: Malaria epidemiology in Lihir Island, Papua New Guinea

  

≤4 yrs

5-9 yrs

10-14 yrs

15-19 yrs

≥20 yrs

p-value

n = 538

n = 571

n = 513

n = 402

n = 1789

Malaria infection

Incidence

1,264

897

441

317

407

< 0.001

IRR (95% CI)

 

0.71 (0.47; 1.07)

0.49 (0.47; 0.51)

0.72 (0.67; 0.77)

1.29 (1.21; 1.37)

P. falciparum

Incidence

754

622

332

242

308

< 0.001

IRR (95% CI)

 

0.83 (0.80; 0.85)

0.53 (0.50; 0.56)

0.73 (0.67; 0.79)

1.27 (1.18; 1.37)

P. vivax

Incidence

514

262

96

64

88

< 0.001

IRR (95% CI)

 

0.51 (0.48; 0.55)

0.37 (0.32; 0.41)

0.67 (0.56; 0.81)

1.37 (1.17; 1.62)

  1. Legend The Incidence Rate Ratio (IRR) compares the incidence of a two consecutive age ranges.