I conducted a two-way between groups ANOVA to test the impact of video gaming (gamer/non-gamer) and gender (male/female) on reaction time. I'm conducted my analysis using SPSS and received the following result: http://imgur.com/8EHKvxN
As you can see, there is no interaction and gender was not significant. However, being a gamer did have a significant impact on response times. I need some help with the effect size. I'm not sure if it's best to use Cohen's criteria (0.01 = small, 0.06 = medium and 0.138 = large) or a different effect size estimate. 0.234 seems ridiculously large in comparison to Cohen's criteria, does this seem right?
I really appreciate your time and help. Thanks.