Print the report, suppress the printing of observation numbers, print the total number of observations for the selected variables and use the BY variable labels in place of the BY variable names in the summary line. The N option prints the number of observations in a BY group at the end of that BY group and prints the total number of observations used in the report at the bottom of the report. NOOBS suppresses the printing of observation numbers at the beginning of the rows. The SUMLABEL option prints the BY variable labels in the summary line in place of the BY variables.

proc print data=exprev n noobs sumlabel;