Although the MPDQ shows promise as a research instrument, the psychometrics of this measure has not been established. The Mobile Phone Dependence Questionnaire (MPDQ Toda, Monden, Kubo, & Morimoto, 2004) has been used in several studies to measure mobile phone dependency and its relation to health‐related lifestyle (Toda, Monden, Kubo, & Morimoto, 2006) among university students in Japan. Although this term has been applied mostly to adults, the high usage rates among adolescents suggest that it may also be a concern in younger populations. The term ‘mobile phone dependency’ has been used to describe a pattern of usage in which ‘addiction’ was referred to as excessive use of mobile phone that can be deemed problematic. The view of the effect of mobile phone dependency is consistent with previous studies (Chen & Katz, 2009 Katz & Askhus, 2002 Ling, 2004 Srivastava, 2005) showing that mobile phone usage directly or indirectly affects many aspects of human relationships and human interactions by providing a direct and private communication channel. In Hong Kong, 85% of youth in the 8‐ to 24‐year‐old age group had mobile phones in the 12‐ to 14‐year‐olds, the rate was 93%, almost double the regional average for that age group. Hong Kong topped the mobile phone category, followed closely by Singapore and South Korea, all affluent markets in which families can afford a second or third mobile phone (The Standard, 2010). The study involved more than 12,000 Asian youths aged from 8 to 24 who were quizzed on their lifestyles, habits, and use of technology. Mobile phones have become virtual extensions of their youthful owners, according to a recent study by a market research firm (The Standard, 2010).
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