Imagine you're a researcher studying how sleep affects mood. To explore the connection, you would look at two key "variables": sleep (how much someone gets) and mood (how happy or irritable they feel) ...

In the article that accompanies this editorial, Lu et al 5 conducted a systematic review on the use of instrumental variable (IV) methods in oncology comparative effectiveness research. The main ...

Discrepancies in long COVID definitions hinder accurate diagnosis and treatment, necessitating a standardized definition for better clinical and research outcomes. A study identified five common ...

Our understanding of sex has come a long way. Aristotle theorized that heat during conception determined whether someone was born male or female. But while researchers have long moved on from that ...

When studying the health effects of probiotics and prebiotics, researchers often observe significant variation in responses to these gut-targeting interventions, both between individuals and between ...