Table 3 Japanese Compulsive Internet Use Scale (CIUS) exploratory factor analysis on first random split half sample (n = 311)

 CIUS-14

How often do you feel restless, frustrated, or irritated when you cannot use the Internet?

 CIUS-6

How often do you think about the Internet, even when not online?

 CIUS-10

How often do you prefer to use the Internet instead of spending time with others (e.g., partner, children, parents)?

 CIUS-5

How often do others (e.g. partner, children, parents) say you should use the Internet less?

 CIUS-11

How often do you rush through your (home) work in order to go on the Internet?

 CIUS-7

How often do you look forward to your next Internet session?

 CIUS-13

How often do you think you should use the Internet less often?

 CIUS-12

How often do you neglect your daily obligations (work, school, or family life) because you prefer to go on the Internet?

 CIUS-2

How often do you continue to use the Internet despite your intention to stop?

 CIUS-1

How often do you find it difficult to stop using the Internet when you are online?

 CIUS-3

How often are you short of sleep because of Internet?

 CIUS-4

How often have you unsuccessfully tried to spend less time on the Internet?

 CIUS-8

How often do you go on the Internet when you are feeling down?

 CIUS-9

How often do you use the Internet to escape from your sorrows or get relief from negative feelings?

% Variance explained

Cronbach’s α coefficient

Chi-square

df

p-value

χ²/df