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How many hours per day does an average Japanese high school girl spend on her phone?

Answer: seven

About 10 percent of Japanese teenage high school girls spend more than 15 hours using their smartphones each day. Boys spend less, but the worldwide technology obsession has some health professionals worried.

Many cite a fear of missing something or of being alone as the reason why they can’t stop using their phones to access social networks and keep in constant contact with other people online.