Ad Click Through Rate (CTR) On Mobile OS

Is the mobile operating system a factor while determining the kind of CTR that ads receive? Apparently it does. Symbian users tend to click on ads much more frequently than Blackberry users. User sophistication could be a factor, but then the iPhone records a high CTR as well.

A study conducted by mobile advertising company Smaato fixed the average ad CTR for all mobile phones at 100 and ranked the CTR of individual platforms based on this index. Here are the results

Symbian : 161
iPhone : 119
Windows Mobile : 112
Feature phones : 84
Android : 65
WebOs : 28
Blackberry : 26