Table 1.

Counts and univariates statistics for key demographic variables of the European and African ancestry groups

	European ancestry	African ancestry
Sample size (N)	66,483	13,285
Female, N (%)	37,001 (55%)	8102 (61%)
Mean (SD) of the person-level median age in years across the EHR	48.71 (22.27)	38.60 (21.33)
Length of EHR in years, Median (Q1-Q3)	9.58 (3.64–15.49)	8.55 (3.43–14.87)
Number of ICD codes Median (Q1-Q3)	131 (47–315)	102 (36–261)
Density of ICD codes (# ICD codes/length of EHR) Median (Q1-Q3)	18.8 (8.16–48.12)	16.81 (7.23–42.41)

Note: EHR, electronic health record; SD, standard deviation; Q1-Q3, first and third quartile.