Table 2.
Statistical analyses of the frequency of the resistant RdlR allele in Aedes albopictus and Culex quinquefasciatus populations from Reunion Island
| Source | Aedes albopictus | Culex quinquefasciatus | ||||
|---|---|---|---|---|---|---|
| χ2 | d.f. | P-value | χ2 | d.f. | P-value | |
| City | 57.25 | 2 | <0.001 | 263.02 | 2 | <0.001 |
| Altitude | 8.06 | 1 | 0.0045 | 29.6 | 1 | <0.001 |
| City × altitude | - | - | - | 19.66 | 2 | <0.001 |
| Month | 14.91 | 1 | <0.001 | 8.91 | 1 | 0.003 |
In these analyses, the influence of city (three-level categorical variable: Saint-Benoit, Saint-Denis, and Saint-Paul), altitude (two-level categorical variable: low and high) and month (as a random variable) were tested. d.f. is the degree of freedom and χ2 is the Chi-square value. Significance of variables was obtained after downward selection based on Akaike’s Information Criterion (AIC).