Editor's Note: Gallup re-estimated its Gallup-Healthways Well-Being Index and Life Evaluation Index data from January 2008 to April 2009 to address context effects that Gallup discovered after the data were originally published.
Religiosity is strongly related to per-capita income worldwide. In the poorest countries Gallup surveyed in 2009, a median of 95% of adults say religion is an important part of their daily lives, compared with 47% who say the same in the world's richest countries.
Americans' self-reported church attendance has continued to inch up in 2010, with 43.1% of Americans reporting weekly or almost weekly attendance. This represents a slight increase from 42.8% in 2009 and 42.1% in 2008.