a nonsignificant trendP =0.39
A nonsignificant trend towards increased mammary tumour incidence was found for parous MMTV-c- myc transgenic/ bax -hemizygous mice (44.4 vs 20 and 20%; P =0.39 by Wilcoxon) as compared to parous c- myc transgenic mice in which bax was intact or completely eliminated ( Figure 1B ).