The study examined the CTRs earned by eight mobile devices, the largest being the Samsung Galaxy Tab (10.1 inches), and the smallest being the Sony Xperia Mini (2.5 inches). The Kindle Fire, with a middle-of-the-pack, 7-inch screen, had the highest CTR—1.02%. The iPad, with a screen size of 9.7 inches, had a CTR of 0.90%. The iPhone, whose four-inch screen is less than half the size of an iPad, garnered a CTR of 0.84%. In fact, the device with the largest screen, the Samsung Galaxy Tab, had a middling CTR of 0.53%. It seems there is no clear correlation between device screen size and a user’s inclination to click on an ad. Read the rest at eMarketer.