Table 1.

Columns and contents of the reference table.

Column Name	Description
TabNam	Table name
ColNam	Column name
test_date	DQe-c run date
FRQ	Number of rows in column
UNIQFRQ	Number of unique values in column
MS1_FRQ	Frequency of missing values, missingness category 1a in column
MS2_FRQ	Frequency of missing values, missingness category 2b in column
MSs_PERC	Percent total missingness in column
Organization	Organization name
CDM	Common data model

^aCategory 1 of missingness measures the presence of absence (true null).

^bCategory 2 of missingness measures the presence of “nonsense.”