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Table 2 Results of the full-null model comparison obtained by analysing urinary neopterin levels from captive and wild living chimpanzees with sex, age, day-time and storage time as fixed effect and animal ID as a random effect (SE = standard error, bold numbers indicate significance)

From: Elevated neopterin levels in wild, healthy chimpanzees indicate constant investment in unspecific immune system

Term Estimate SE DF χ2 P-value
Intercept 4.900 0.116    
Age at sample collection −0.044 0.053 1 0.617 0.413
Sex 0.090 0.092 1 0.964 0.326
Environment 0.708 0.158 2 22.41 < 0.001
Day-time 0.085 0.062 1 1.852 0.174
Storage time 0.094 0.065 1 2.050 0.152