Prevalence of internet addiction and the related factors in middle school students in Guangzhou / 南方医科大学学报

<p><b>OBJECTIVE</b>To study the status of and the factors contributing to Internet addiction among middle school students in Guangzhou.</p><p><b>METHODS</b>Cluster sampling method was used to recruit an urban middle school, a rural junior middle school and a rural senior high school to conduct the survey with the stressful life event questionnaire, the trait-oriented coping styles questionnaire and the Internet Addiction Test.</p><p><b>RESULTS</b>The majority of respondents were classified as normal users of the Internet (n=1392, 89.2%), with 158 (10.2%) moderately and 10 (0.6%) severely addicted to the Internet. Fifty-eight students had never used the Internet. There were significant differences in gender, the father's education, the 4 dimensions of the stressful life event questionnaire and the coping styles between students with and without Internet addiction. Binary logistic analysis showed that the factors contributing to Internet addiction included passive coping styles, male gender and stressful life event experienced in family and interpersonal communication.</p><p><b>CONCLUSIONS</b>The incidence of Internet addiction is high among middle school students in Guangzhou. Male students with stressful life events in family and interpersonal communication, poor education on the part of the father, and frequent use of negative coping styles are more likely to develop Internet addiction.</p>

Dynamic image-pathological investigation on MR diffusion weighted imaging in rabbit liver VX_2 tumor model / 中华放射学杂志

Objective To investigate the value and dynamic characteristics of diffusion-weighted imaging(DWI)in rabbit liver VX_2 tumor model,with correlation of pathology.Methods Forty New Zealand rabbits were included in the study and VX_2 tumor piece was implanted directly into the liver after laporotomy.Fiffteen had two intrahepatic implants while twenty-five had one implant.DWI was performed on the seventh,fourteenth and twenty-first day after implantation,while routine T_1WI and T_2WI sequences were done on the seventh and fourteenth day.Ten VX_2 tumor samples were studied by pathology.Results The lump detection rates on the seventh day after implantation of DWI,T_1WI and T_2WI were 78.7%(37/47), 10.7%(3/28)and 53.6%(15/28)respectively with statistical significance(x~2=32.61,P