31.   The new study is based on information compiled from payment reports submitted by the nursing homes to the federal government.

32.   The new study was based on a methodology known as case matching.

33.   The new study was based on manipulation of osteoblast apoptosis in the test tube and in mice.

34.   The preliminary study was based on underwater video and trawling.

35.   The preliminary industry study is based on a computer-generated program examining insured property in the region hit by the storm.

36.   The study was based on a nationwide survey released in September by the U.S. Department of Agriculture.

37.   The study was based on a survey of teen-agers and their parents.

38.   The study was based on Census Bureau data and published by the non-profit Population Reference Bureau, a Washington-based research group.

39.   The study was based on mortality statistics maintained by the National Center for Health Statistics compared to U.S. Census population data for the study years.

40.   The study is based on reports compiled by the Tobacco Institute from state tax agencies.