This study had two aims: to test the effect and the effect size of specific problematic Internet use (SPIU) [online shopping. online pornography. social network site (SNS) usage. and Internet gaming] on generalized problematic Internet use (GPIU) and to reveal the gender differences in GPIU and SPIU for students from the elementary school level to the university level. https://fitnessgravesyardes.shop/product-category/heart-rate-re/