Figure 5. Effects of biological and methodological factors on the repeatability of telomere length. Measurement method (B) and study length (E) affected clearly the repeatability of telomere length, while the effect of the biological variables (A: taxon, C: environment, D: age class, and F: species lifespan) were small and their effect size overlapped with zero (G). For illustration purposes, fits on the continuous predictors are the result of frequentist models on the best fitting model in table 2, but are consistent with the conclusions of the model in table 2.