No idea. ALL roids can have an effect. Some more than others. Some directly and some indirectly. It's a common and well known side effect. Unfortunately it tends to be a very individual thing. I've used var (not at high doses - 50 and 60mg a day I think) and my hair hasn't changed.
Hre's the thing. To my mind, given it's a risk, you roll the dice if you insist on going ahead. Then you have a LOT of guys get hung up on their hair, hair line, how thick it is and so on. Me - I just cut it down to the scalp Military style. IF it's that big of a problem - don't do drugs m'kay lol