Figure 2.

Ratio of participants involved in ten online activities stratified by educational stages and sex: ratio of users (dark gray) and nonusers (light gray) are shown with bars.

Notes: The top and bottom rows in each panel correspond to M and F. Four bars in the top and bottom rows of each panel correspond to E, J, S, and U, from left to right. Results of χ² test between males and females within each educational stage are indicated as follows: ^***P<0.001; ^**P<0.01; ^*P<0.05.

Abbreviations: E, elementary; F, female; J, junior high school; M, male; S, senior high school; U, university.