Psychometric property and measurement invariance of internet addiction test: the effect of socio-demographic and internet use variables.

Background: According to the validation literature on items of Young's Internet Addiction Test (IAT), this study rephrased disputable items to improve the psychometric properties of this Chinese version of IAT and identify the presence of differential item function (DIF) among demographic and Internet use factors; detect the effect of demographic and Internet use factors on IAT after adjusting for DIF.

Methods: An online questionnaire was distributed to college students in Zhe Jiang province in two stage. The 1st phase study collected 384 valid responses to examine the quality of IAT items by using Rasch Model analysis and exploring factor analysis (EFA).

Sexual and reproductive health knowledge among primary school students in Malaysia.

Background: There is limited research on sexual and reproductive health (SRH) knowledge level among very young adolescents aged between 10 and 14 years. Policy makers and educators are unable to address very young adolescents' SRH needs without proper understanding of their SRH knowledge. Thus, the objective of this study is to explore very young adolescents' SRH knowledge level and the influences of demographic variables on the respondents' SRH knowledge level in Malaysian primary schools.