The best generalized linear models showing the most significant relationships between the regional prey indices and body condition in breeding tawny owls. Other factors probably related to body condition were also included in the preliminary analyses. Estimates, standard errors (SE), test statistics (), and their significance () as well as adjusted coefficients of determination for each single variable (Adj ) and the difference between adjusted coefficients of determination of subsequent variables in the model ( Adj ) are given. For total models, test statistics (), their significance (), and adjusted coefficients of determination (Adj ) are presented.