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Table 1 Factors explaining the variation in volume of the uropygial gland in house sparrows. Scaled body mass index, haemosporidian infection, sex, locality and the two-way interactions between sex and scaled body mass index, between infection status and scaled body mass index and between infection and locality were included in the analysis as predictor variables. Sample size was 222 individuals

From: Volume and antimicrobial activity of secretions of the uropygial gland are correlated with malaria infection in house sparrows

Independent variable Square-sum III DF F P
Scaled body mass index 4695.89 1 0.190 0.7176
Infection 3787.71 1 4.082 0.046
Sex 5574.75 1 4.122 0.036
Locality 14282.25 1 10.464 < 0.001
Sex × Scaled body mass 5061.31 1 4.084 0.045
Infection × Scaled body mass 4695.89 1 4.354 0.027
Infection × Locality 1153.53 1 0.845 0.359