How to use a post-hoc test

G Anova: Single Factor SUMMARY Groups Count Sum Average Variance Condition 1 15 5317 354.466667 814.838095 Condition 2 15 4825 321.666667 577.238095 Condition 3 15 4884 325.6 625.4 Condition 4 15 4472 298.133333 636.12381 ANOVA Source of Variation SS df MS F P-value F crit Between Groups 24023.53333 3 8007.84444 12.0709141 0.00000335 2.76943093 Within Groups 37150.4 56 663.4 Total 61173.93333 59 Comparison Abs. Mean Diff 1 vs. 2 32.8 1 vs. 3 28.86666667 1 vs. 4 56.33333333 2 VS. 3 3.933333333 4 2 vs. 4 23.53333333 5 3 VS. 4 27.46666667 6