NPD Group on Thursday released the results of its Apple Ecosystem Study, which suggests that almost 25% of U.S. iPad owners are first-time Apple buyers. The firm’s data, as reported by AppleInsider, indicated that 33% of U.S. households own Apple products, with a majority owning an iPod. That number is growing beyond the 37 million American households the Cupertino-based company’s products are already found in, thanks to Apple’s flagship tablet. “iPad sales are growing much faster than any other Apple product has this soon after launch,” said Ben Arnold, director of industry analysis at NPD. “In fact, one-in-five Apple owner households has one — nearly equivalent to the number that own an Apple computer. This demonstrates the appeal of both the new form factor and Apple’s app ecosystem.” The study found that six out of ten homes with a Mac also own a Windows PC, and nearly 30% of so-called “Apple enthusiasts” own a smartphone other than the iPhone. The data comes from a survey NPD conducted in February of more than 3,000 consumers.