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Table 1 Likelihood of malaria infection and disease severity by age group

From: Malaria infection, disease and mortality among children and adults on the coast of Kenya

Measure 6 months–4 years 5–14 years 15–49 years 50+ years Overall
Parasite prevalence (PR)
 % (95% CI) 10.1% (8.5, 12.0) 13.4% (12.0, 14.9) 7.1% (6.0, 8.4) 4.3% (2.8, 6.4) 9.9% (9.2, 10.7)
 n/N 136/1342 337/2523 146/2056 24/558 643/6479
Fever test positivity prevalence
 % (95% CI) 22.0% (13.8, 33.3) 35.0% (25.3, 47.1) 28.9% (18.9, 42.3) 11.4% (3.1, 29.3) 27.3% (22.7, 32.3)
 n/N 22/200 43/123 26/90 4/35 95/348
Malaria passive period prevalence
 ‰ (95% CI) 251.3‰ (241.8, 261.1) 271.0‰ (264.4, 277.7) 93.3‰ (89.8, 96.9) 47.8‰ (43.2, 52.8) 169.7‰ (166.9, 172.5)
 n/N 2628/10,456 6388/23,571 2733/29,297 394/8238 12,143/71,562
Malaria passive incidence rate
 ‰ (95% CI) 121.5‰ (114.9, 128.3) 150.1‰ (145.2, 155.2) 60.0‰ (57.3, 62.9) 33.4‰ (29.6, 37.6) 95.6‰ (93.5, 97.8)
 n/N 1270/10,456 3539/23,571 1759/29,297 275/8238 6843/71,562
Malaria admissions
 ‰ (95% CI) 4.7‰ (3.5, 6.2) 1.0‰ (0.7, 1.5) 0.07‰ (0.008, 0.2) 0.1‰ (0.003, 0.7) 1.1‰ (0.8, 1.3)
 n/N 49/10,456 24/23,571 2/29,297 1/8283 76/71,562
Severe malaria
 ‰ (95% CI) 2.9‰ (1.9, 4.1) 0.6‰ (0.3, 0.9) 0‰ (0, 0.1) 0‰ (0, 0.4) 0.6‰ (0.4, 0.8)
 n/N 30/10,456 13/23,571 0/29,297 0/8283 43/71,562
Hospital malaria deaths
 ‰ (95% CI) 0.1‰ (0.002, 0.5) 0.1‰ (0.03, 0.4) 0‰ (0, 0.1) 0‰ (0, 0.4) 0.06‰ (0.02, 0.1)
 n/N 1/10,456 3/23,571 0/29,297 0/8283 4/71,562
Hospital + InterVA malaria Deaths
 ‰ (95% CI) 0.4‰ (0.1, 1.0) 0.3‰ (0.1, 0.6) 0‰ (0, 0.1) 0‰ (0, 0.4) 0.1‰ (0.07, 0.3)
 n/N 4/10,456 6/23,571 0/29,297 0/8283 10/71,562
Hospital + interVA + imputed malaria deaths
 ‰ (95% CI) 0.6‰ (0.2, 1.2) 0.3‰ (0.09, 0.6) 0‰ (0, 0.1) 0‰ (0, 0.4) 0.2‰ (0.09, 0.3)
 n/N 6/10,456 6/23,571 0/29,297 0/8283 12/71,562
  1. Parasite prevalence was defined as the number of positive RDTs/total number of RDTs done in the community expressed per 100; fever test positivity prevalence was defined as the number positive RDTs/total number of community participants with fever (i.e. reported/measured fever); malaria passive period prevalence was defined as all cases testing RDT positive including re-attendance/person-years of observation expressed per 1000 individuals; malaria passive incidence rate was defined using records of first cases only of RDT positive patients/person-years of observation expressed per 1000 individuals; malaria admission was defined as number of episodes of malaria admissions/person-years of observation; severe malaria was defined as number of episodes of severe malaria admissions/person-years of observation (3 patients had been re-admitted to hospital with malaria each presenting twice and only one had severe malaria on both occasion); hospital malaria deaths was defined as the number of death during hospital admission attributable to malaria/person-years of observation; hospital + interVA malaria deaths was defined as the number of death attributable to malaria assigned either in the hospital or from the InterVA-4 model/person-years of observation; hospital + InterVA malaria deaths + imputed malaria deaths was defined as the number of death attributable to malaria assigned either in the hospital or from the InterVA-4 model or from multiple imputation/person-years of observation