1.   All previous studies have been based on statistics provided by individual nations.

2.   Of course, many formally published studies are based on primary-direct observation data.

3.   Other studies will be based on detailed comparisons of returns for the Censuses of Production for each country.

4.   The most fruitful studies have been based on calculated energy levels.

5.   The study is based on results collected by environmental health officers from five local authorities in the course of their inspections.

6.   Roberts has spent much of his working life collating the data on which the study was based.

7.   In vivo BrdUrd based studies, however, have serious practical limitations.

8.   The study is based on a survey of records from locations where radioactive material is known to have been stored, manufactured or spilt.

9.   The studies are based on ice samples extracted by a drilling operation mounted by a consortium of scientists from eight European countries.

10.   Although the study is based entirely on California data, criminal justice experts say the issue is a national one.