Two sets of data were entered into a spreadsheet program (Microsoft©
Excel 2000). The variables included in the first data set were:
The second data set consisted of 1) to 4) in the first
set plus:
The data in the spreadsheets were exported to S-Plus for Windows Version 6 Release
2 for data verification. Summary statistics (e.g. mean, median total sum)
were produced for each variable as well as quartiles for continuous variables,
and counts for categorical variables. If a variable exceeded logical consistencies,
the raw data were checked, and if necessary ground checks were made to verify
data accuracy.