A study on the factors affecting the follow-up participation in birth cohorts.

Objectives: A stable follow-up participation rate is a very important factor for validity in a cohort study. This study analyzed the factors that affect the participation rate at one hospital-based birth cohort in South Korean.

Methods: The participants were recruited from the Mothers' and Children's Environmental Health study between 2006 and 2010.

Comparison of risk and protective factors associated with smartphone addiction and Internet addiction.

Background And Aims: Smartphone addiction is a recent concern that has resulted from the dramatic increase in worldwide smartphone use. This study assessed the risk and protective factors associated with smartphone addiction in college students and compared these factors to those linked to Internet addiction.

Methods: College students (N = 448) in South Korea completed the Smartphone Addiction Scale, the Young's Internet Addiction Test, the Alcohol Use Disorders Identification Test, the Beck Depression Inventory I, the State-Trait Anxiety Inventory (Trait Version), the Character Strengths Test, and the Connor-Davidson Resilience Scale.

Latent class analysis on internet and smartphone addiction in college students.

Purpose: This study aimed to classify distinct subgroups of people who use both smartphone and the internet based on addiction severity levels. Additionally, how the classified groups differed in terms of sex and psychosocial traits was examined.

Methods: A total of 448 university students (178 males and 270 females) in Korea participated.