I. Personal Information | |
(1) Your age? | _______year old |
(2) When did you start smartphone use? | 1. Elementary school 2. Junior high school 3. High school 4. University and after |
(3) How many hours do you use smartphone in a day? | 1. Less than 3 hours 2. 3 ~ 5 hours 3. 5 ~ 7 hours 4. 7 ~ 9 hours 5. More than 9 hours |