I was reading through Andy Field's *Discovering Statistics with SPSS*. Following ANOVA, he ran several post-hoc tests. 

[![enter image description here][1]][1]
[![enter image description here][2]][2]

When he described how to report the planned contrast and post-hoc results, he wrote this: 

> “Planned contrasts revealed that having any dose of Viagra
> significantly increased libido compared to having a placebo, t(12) =
> 2.47, p =.029, r =.58, but having a high dose did not significantly increase libido compared to having a low dose, t(12) = 2.03, p =.065,
> r =.51.”

**Where did the r come from??**


  [1]: https://i.sstatic.net/rltjs.png


  [2]: https://i.sstatic.net/4xQhx.png