microstrip power handling

I understand the power handling of the microstrip line is worse as compared to that of cavity and waveguide.
I'm wandering how to find the relative data about power handling of microstrip line.
I serve the board fabrication website such as Rogers cooporation and find out little information.
They only provide power handling for the characteristic impedance of 50 ohm; however, they do not offer the that for high-impedance line, such as larger than 100 or even 150 ohm.
Could anyone tell me how to look for the relative data? Or how do I estimate the power handling for alternative impedances if I only know that for 50 ohm?
Thanks a lot!

There is a section in this book regarding microstrip power handling:

http://www.amazon.com/Microstrip-Slo...6048437&sr=1-1

Thanks jallem a lot.