Need help with understanding and explanation . I have already ran the spss Just need help

I need to understand in where can I figure out the H0 for the test and can this reject the null Hypothesis and maybe be show that there was change over time?

looking at the Plot and F-test , what is seen over the change over time?

Within-Subjects Factors Measure: MEASURE_1 Dependent Time Variable 1 Pre Post 3 Followup Multivariate Testsa Hypothesis Effect Value F df Error df Sig. Time Pillai's Trace .451 17.677 2.000 43.000 <.001 wilks lambda hotelling trace roy largest root a. design: intercept within subjects time b. exact statistic mauchly test of sphericitya measure: measure_1 epsilon approx. chi- greenhouse- lower- effect w square df sig. geisser huynh-feldt bound tests the null hypothesis that error covariance matrix orthonormalized transformed dependent variables is proportional to an identity matrix.measure: .729 matrix. may be used adjust degrees freedom for averaged significance. corrected are displayed in within-subjects effects table. type ill sum source squares mean f sphericity assumed greenhouse-geisser lower-bound contrasts ource linear quadratic rror between-subjects ransformed variable: average itercept plots estimated marginal means>