Janet Chrzan and Adriana Perez of the School of Nursing hypothesized about the reasons women are outliving men in Philadelphia. “Women are tougher,” said Chrzan. “They have better immune systems, and they tend to survive better than men in every society.”
https://www.inquirer.com/news/women-men-african-american-latino-whites-homicide-diabetes-heart-disease-poverty-20191111.html Philadelphia Inquirer