Response: mortalité Pr(>F)   
culture                    < 2.2e-16 ***
région 1.935e-09 ***
stade < 2.2e-16 ***
Culture*région 2.293e-08 ***
Culture*stade 2.890e-06 ***
Région*stade 3.884e-08 ***
Culture*région*stade 0.0004671 ***
Table 2: Testing the effect of three factors (culture, stage and region)on mortality.