Table 1

Statistical analysis of the effects of mosquito family and parasite isolate on the success of infection. The proportion of infected mosquitoes (a, nominal logistic analysis) and the square root of the number of oocysts (b, ANOVA) were analysed as a function of the mosquito family, the parasite isolate, and their interaction. In both analyses, the mosquito's wing length was included as a confounder. As the study was run in three experimental blocks using different families and isolates, the factors family, isolate and their interaction were nested within block. Block, family and isolate were considered as random factors.


(a) Proportion infected
 (b) Intensity of infection
Source
 d.f.
 χ2
 P
 Sum of Squares
 F
 P
Experimental Block
 2
 85.5
 <0.001
 265.2
 2.40
 0.155
Wing Length
 1
 3.1
 0.029
 6.4
 7.14
 0.008
Family (within Block)
 14
 3.8
 0.927
 29.5
 0.66
 0.800
Isolate (within Block)
 8
 15.5
 0.482
 462.5
 19.40
 <0.001
Family*Isolate (within Block)
 34
 127.2
 <0.001
 110.2
 3.59
 <0.001
Error (for analysis b)
 395

356.8

Lambrechts et al. Malaria Journal 2005 4:3   doi:10.1186/1475-2875-4-3

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