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.
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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.