The term, an abbreviation for "no-mobile-phone phobia",[9] was coined during a 2010 study by the UK Post Office who commissioned YouGov, a UK-based research organization to look at anxieties suffered by mobile phone users. The study found that nearly 53% of mobile phone users in Britain tend to be anxious when they "lose their mobile phone, run out of battery or credit, or have no network coverage". The study found that about 58% of men and 47% of women suffer from the phobia, and an additional 9% feel stressed when their mobile phones are off. The study sampled 2,163 people. Fifty-five percent of those surveyed cited keeping in touch with friends or family as the main reason that they got anxious when they could not use their mobile phones.[2][10] The study compared stress levels induced by the average case of nomophobia to be on-par with those of "wedding day jitters" and trips to the dentist.[11] Another study found that out of 547 male, undergraduate students in Health Services 23% of the students were classified as nomophobic while an additional 64% were at risk of developing nomophobia. Of these students, ~77% checked their mobile phones 35 or more times a day.[12]