I looked at the Effect of ADHD on Global Seasonality Score (GSS), mediated by both Sleep onset time on Free days and Sleep duration on Free days (N= 1738).
The indirect effect of ADHD on seasonality through mediator Sleep onset time (free days) = c, c =0.003 (0.001 - 0.007)
Effect of second mediator sleep duration (free days) on GSS was not significant.
c =0.000 (-0.003 - 0.002) Sleep duration (free days)
My question is, even though effect of ADHD on seasonality through mediator Sleep onset time (free days) is very small, it is significant. c =0.003 (0.001 - 0.007) .
How do I interpret this? What can I say about the effect size of this mediator?