It is based on a survey every two years of 60,000 households.

The findings were based on a survey of 141 officers.

The report is based on a survey of more than 33,000 households.

The report, based on a survey of 242 businesses, was made public yesterday.

An analysis published in 1968 was based on a survey of over 6,000.

The report was based on a survey of 322 cities and towns.

The report was based on a survey of more than 4,000 women ages 60 to 79.

Today's article is one of a series based on a survey conducted in 1982.

The findings were based on a national survey of 8,098 people.

Research for the book is based on a survey of more than 2,000 business executives.