Effects of salinity treatments, infection status by Hydrachna skorikowi, sex (female and male) and their interactions on survival times in Sigara lateralis adults (Cox regression analysis).

Salinity treatments were 0.5, 5, 10 and 15 g/l, and water from the collection site as a control (Ctrl: 0.8 g/l). The table shows for each term in the design matrix the estimated coefficient (coef), the relative risk exp () (exp (coef)), the standard error, the z-value and the corresponding P-value. Each P-value provides a test for the difference of each level with respect to the baseline. The overall P-value for factors with more than two levels (i.e. salinity) and interactions infection status*sex, sex*salinity are obtained through the Wald test and are shown under the table.