From HRpre, derive the ordinal variable HRCatpre so that students whose heart rate is less than 80 beats/minute are categorized as excellent (coded 1), those whose heart rate is between 80 and 90 are categorized as good (coded 2), those whose heart rate is between 90 and 110 are categorized as average (coded 3), those whose heart rate is between 110 and 120 are categorized as poor (coded 4), and those whose heart rate is greater than 120 are categorized as very poor (coded 5)