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. Author manuscript; available in PMC: 2014 Mar 25.
Published in final edited form as: Physiol Behav. 2013 Apr 26;122:222–227. doi: 10.1016/j.physbeh.2013.04.004

Table 1.

GLM model testing the effect of maternal treatment, social environment, sex, and exposure to predation risk over time on plasma cortisol in the threespine stickleback.

Source DF Type I SS Mean square F value p
Maternal treatment 1 0.07183249 0.07183249 0.10 0.7515
Time 2 22.41042515 11.20521258 15.69 <.0001
Social environment 1 22.04691896 22.04691896 30.87 <.0001
Sex 1 10.24221408 10.24221408 14.34 0.0002
Date 1 7.17508595 7.17508595 10.05 0.0018
Maternal treatment * Time 2 4.38936628 2.19468314 3.07 0.0490

Date was included in the model as a covariate and did not significantly interact with any of the class variables (i.e. p > 0.05 for all interactions). Interactions that were not significant (i.e. p > 0.05) in the full model were stepwise-removed until only significant interactions remained.