Nearly half of Americans are struggling to stay happy and healthy, and just about half are reported to be thriving.

That's according to a massive survey that attempts to measure the nation's general welfare.

More than 100,000 people participated in the Gallup-Healthways Well-Being Index. The results are based on personal assessments of how participants said they felt about their lives at the time of the survey and where they think they'll be in five years.

Four percent of Americans polled are reported to be suffering.

Gallup's chief scientist for well-being said people who are thriving tend to have higher incomes, more education and less illness. Those who are suffering have trouble meeting their basic needs, including food, shelter and medical care.