Descriptive statistics of bilateral asymmetry.

Levels of fluctuating (FA) and directional (DA) asymmetry relative to measurement error (ME) were obtained from mixed regression model analysis and formed the basis to calculate repeatabilities [intraclass correlation coefficient (ICC) = FA/ (FA+ME)]. While FA was highly significant for all traits (LR-test with distribution being a 50∶50 mixture of and ), none showed significant DA.1See Fig.1 for description of trait names.