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Table 6 Prevalence (with 95% confidence limits) by age group of malaria parasitaemia and three measures of mild malaria morbidity in highland and lowland hamlets from monthly surveys in hamlets with or without treated nets in the post-intervention year.

From: Variation of malaria transmission and morbidity with altitude in Tanzania and with introduction of alphacypermethrin treated nets

  Altitude Treated Nets? Age group   
    6 mo-2 yrs 2–5 yrs 6–12 yrs
% with malaria parasites High Yes 31.4(26.1,36.7) 44.3 (40.6, 48.0) 49.4 (46.3, 52.6)
   No 54.1(48.9,59.5)
[2.60***(1.86, 3.64)]
73.0(69.9,76.1)
[3.55***(1.95, 6.49)]
67.7 (65.0, 70.5)
[2.14***(1.39, 3.28)]
  Low Yes 63.1(56.2,69.9) 78.3 (74.9, 81.7) 80.6 (77.9 (83.3)
   No 82.9 (77.8, 87.9)
[2.80***(1.70, 4.59)]
88.8(86.2,91.4)
[2.21**(1.11, 3.68)]
83.3 (80.9, 85.8)
[1.25 n.s.(0.70, 2.23)]
% with malaria feverf High Yes 2.3(0.6,4.1) 1.8(0.8,2.8) 0.4 (0.0, 0.8)
   No 7.4(4.6,10.2)
[3.10**(1.27, 7.60)]
4.5(3.1,5.9)
[2.70**(1.31, 5.57)]
1.2(0.6,1.9)
[2.71* (1.06, 6.93)]
  Low Yes 5.1 (2.0,8.3) 3.2(1.7,4.6) 1.3(0.6,2.1)
   No 14.8 (10.0, 19.6)
[3.14***(1.96, 5.02)]
8.0 (5.7, 10.2)
[2.56**(1.32, 4.97)]
1.0(0.4,1.7)
[0.76 n.s.(0.26, 2.22)]
% anaemicw
(<8 g Hb/dl)
High Yes 3.9(1.6,6.2) 2.0 (0.9,3.0) 0.7(0.1,1.2)
   No 19.9(15.5,24.3)
[5.86***(2.89, 11.87)]
4.3 (2.9, 5.8)
[2.43**(1.31, 4.51)]
2.2(1.3,3.0)
[2.94**(1.27, 6.82)]
  Low Yes 15.4(10.3,20.6) 3.4(1.9,4.8) 2.1(1.1,3.1)
   No 37.5(31.0,44.0)
[3.59***(2.01, 6.40)]
8.2 (5.9, 10.4)
[2.75**(1.39, 5.43)]
4.2 (2.9, 5.5)
[1.85 n.s.(0.83, 4.12)]
% with splenomegaly High Yes 12.4(8.6,16.1) 26.1(22.9,29.3) 33.3 (30.3, 36.3)
   No 39.2 (34.0, 44.5)
[4.93***(2.51, 9.70)]
52.5 (49.0, 56.0)
[3.23**(1.53, 6.84)]
52.9 (50.0, 55.9)
[2.32**(1.21, 4.46)]
  Low Yes 51.1(43.9,58.2) 70.8 (67.0, 74.6) 56.0 (52.5, 59.5)
   No 69.6 (63.4, 75.8)
[2.18*(1.09,4.34)]
75.4(71.8,79.0)
[1.26 n.s.(0.80, 1.99)]
60.8(57.6,64.1)
[1.25 n.s.(0.88, 1.76)]
  1. [Shown in square parentheses are odds ratios (with 95% confidence limits) in hamlets without nets relative to values of 1.0 in corresponding hamlets with nets] Footnotes as for Table 5.