Table 3.

Descriptive statistics: cholesterols

TEST (%)	885936 (31.6%)
HDL mean (SD)	1.28 (0.37)
LDL mean (SD)	2.62 (0.96)
TRI mean (SD)	1.74 (1.04)
TCL mean (SD)	4.69 (1.13)
TC/HDL mean (SD)	3.85 (1.15)
TESTED (%)	2,698,599 (96.3%)

TEST and TESTED are auxiliary binary features indicating whether the patient had a cholesterol test in this quarter (encompassing HDL, LDL, TRI, TCL and TC/HDL), and whether the patient has ever had a cholesterol test respectively. If the patient has any of the listed elements tested in a quarter the value of TEST will be 1, otherwise 0. In a patient’s time-series, the value of TESTED will be 0 prior to the patient having their first cholesterol test. Once the patient has had a cholesterol test, the value of TESTED will switch to 1 and stay at 1 for the remainder of the time-series. The statistics for TEST and TESTED are the number of quarters in the entire data set where the feature contained a 1 and its relative percentage