Video Game Addictive Symptom Level, Use Intensity, and Hedonic Experience: Cross-sectional Questionnaire Study.

Background: The effects of behavioral addiction to video games has received increasing attention in the literature, given increased use intensity among subgroups of video game players.

Objective: This study seeks to empirically determine the relationship between intensity of video gaming and hedonic experience of the player.

Methods: We conducted a survey of 835 individuals who regularly play video games to determine the relationship between intensity of use and hedonic experience.

Age at League Entry and Early All-Cause Mortality among National Football League Players.

Background: A growing body of research suggests that American football players are exposed to higher cumulative head impact risk as competition level rises. Related literature finds that head impacts absorbed by youth, adolescent, and emerging adult players are associated with elevated risk of long-term health problems (e.g.

Mortality risk factors among National Football League players: An analysis using player career data.

In general, National Football League (NFL) players tend to live longer than the general population. However, little information exists about the long-term mortality risk in this population. Frequent, yet mild, head trauma may be associated with early mortality in this group of elite athletes.

Measuring individual worker output in a complementary team setting: Does regularized adjusted plus minus isolate individual NBA player contributions?

Adjusted plus minus (APM) measures have redefined our understanding of player value in basketball and hockey, where both are team games featuring player productivity spillovers. APM measures use seasonal play-by-play data to estimate individual player contributions. If a team's overall score margin success is figuratively represented by a pie, APM measures are well-designed to slice the pie and attribute individual contributions accordingly.

Association of Professional Football Cumulative Head Impact Index Scores With All-Cause Mortality Among National Football League Players.

Importance: Long-term adverse health outcomes, particularly those associated with repetitive head impacts, are of growing concern among US-style football players in the US and Canada.

Objective: To assess whether exposure to repetitive head impacts during a professional football career is associated with an increase in the risk of all-cause mortality.

Design, Setting, And Participants: This retrospective cohort study included 13 912 players in the 1969 to 2017 National Football League (NFL) seasons.

The aggregation paradox for statistical rankings and nonparametric tests.

The relationship between social choice aggregation rules and non-parametric statistical tests has been established for several cases. An outstanding, general question at this intersection is whether there exists a non-parametric test that is consistent upon aggregation of data sets (not subject to Yule-Simpson Aggregation Paradox reversals for any ordinal data). Inconsistency has been shown for several non-parametric tests, where the property bears fundamentally upon robustness (ambiguity) of non-parametric test (social choice) results.

The alliance formation puzzle in contests with capacity-constraints: A test using American football reception-coverage contest data.

We utilize a contest-theoretic model to demonstrate a version of the alliance formation puzzle that aligns with reception-coverage contests in American football. Namely, secondary defenders can opt for single-coverage-1 v 1 contest. Alternatively, they can choose to ally-form double-coverage or 2 v 1 contest with exogenous intra-alliance prize division-when defending a given receiver.

A Systematic Review of Etiological Risk Factors Associated With Early Mortality Among National Football League Players.

Background: Multiple risks predispose professional football players to adverse health outcomes and, in extreme cases, early death; however, our understanding of etiological risk factors related to early mortality is limited.

Purpose: To identify etiological risk factors associated with all-cause and cause-specific mortality among National Football League (NFL) players.

Study Design: Systematic review; Level of evidence, 3.