Fig. 4. Duration of different agonistic levels per fight (A,B) and probabilities (P) of urine release at these levels (C,D) in winners (A,C) and losers (B,D). Values are means +1 S.E.M. for 39 fights. Asterisks denote significant differences with respect to the mean probability over all agonistic levels (^*P<0.05, ^**P<0.01; logistic regression analysis). Probabilities at level 0 and 1 are generally lower, while those of levels 3-5 are higher, than the mean probability of urine release as estimated by the logistic model. At levels -2 and -1, probabilities are smaller than the mean only in losers.