The study based its findings on World Values Surveys data collected at the University of Michigan.
The study based its findings primarily on statistics from the C.D.C. and the National Center for Health Statistics.
The study based its findings on surveys of 5,000 high school seniors in 30 states before and after the laws went into effect between 1984 and 1998.
Researchers are looking for more patients for the study based at UCL/Middlesex and Guy's hospitals in London and Cookridge hospital, Leeds.
The study, based on interviews with senior agency officials and a review of technical literature on the subject, cited several specific problems.
The study, based on interviews with 1,244 girls and women in the small kingdom on South Africa's border with Mozambique, was published last week in The Lancet.
The study, based on self-reported data from more than 10,000 high school students, also found other evidence of more conservative sexual behavior.
The study based its findings on data culled from lawsuits, police sting operations and racial testing over the last 14 years.
Researchers say the study, based on brain scans of compulsive hoarders, provides the first solid evidence that hoarding defines a distinct subset of patients.
The study, based on a survey of 14,138 students last year, appeared in this week's Journal of the American Medical Association.
But the study, based on a written survey of the top editors at 259 newspapers of all sizes and interviews with some, seeks to quantify the change.
