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Table 4 Analyses of preen gland volume and PC2 composition of secretions for each sex

From: Uropygial gland size and composition varies according to experimentally modified microbiome in Great tits

a Uropygial gland volume      
  Females    Estimate ± SE df F P
   Date   0.01 ± 0.01 1,50 4.25 0.04
   Year   0.15 ± 0.04 1,50 13.89 <0.001
   Wing length   0.41 ± 0.13 1,50 10.6 0.002
  Males   Estimate ± SE df F P
   Date   −0.01 ± 0.004 1,36 7,0 0.01
   Year   0.21 ± 0.06 1,36 13,0 0.001
   Body condition   0.16 ± 0.04 1,36 12.5 0.001
   Treatment Nisin 0.16 ± 0.07 2,36 4.3 0.02
    TSB 0.16 ± 0.06    
b Uropygial gland composition - PC2      
  Females    Estimate ± SE df F P
   Date   0.07 ± 0.03 1,27 5.5 0.03
   Treatment Nisin 2.38 ± 0.69 2,27 6.5 0.005
    TSB 1.95 ± 0.71    
  Males   Estimate ± SE df F P
   Body condition   −0.51 ± 0.22 1,21 5.4 0.03
  1. The compounds produced and their contribution to the principal components are given in Table 1. The table present final models after backward selection. Treatment effects estimates compared to the control are shown.