Table 1 Summary of variables and validation measures estimated in the medical record and case report
From: Assessing the validity of tuberculosis surveillance data in California
Variable Type (n, %) | Variable Number* | Medical Record Values | Report of Verified Case of Tuberculosis (RVCT) Values | Number of Values and Validation Measures Estimated | |
|---|---|---|---|---|---|
n = 34 (77%) | 1, 3, 4, 7, 8, 9, 10, 11, 12, 13, 15, 16, 17, 19, 21, 22, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 39, 40, 41, 42, 43, 44 | 'Yes' 'No' 'Not Charted' | 'Yes' 'No' 'Not Done' (n = 15) 'Unknown' | 2 × 2 tables: Concordance Sensitivity Positive Predictive Value | |
Categorical n = 44 | 2, 6, 14, 23, 36, 37, 38 | Various values | Various values | n × n tables (values = 3–6): Concordance | |
n = 10 (23%) | 2 × 2 tables: collapsed n × n tables to n (2 × 2) tables† | ||||
Sensitivity Positive Predictive Value | |||||
5, 18, 20 | n × n tables (values=96–268): Concordance | ||||
Dates n = 9 | n = 7 (78%) | Month/Day/Year 46, 48, 49, 50, 51, 52, 53 | MM/DD/YYYY | MM/DD/YYYY | Absolute mean difference (days) |
n = 2 (22%) | Month/Year 45, 47 | MM/DD/YYYY | MM/YYYY | Absolute mean difference (months) | |
- * See Table 2, first column, for variable number (Note: these numbers do not correspond to the variable numbers on the RVCT form).
- † For each of the n values, we constructed a 2 × 2 table from (1) the number of individuals for which the medical record and RVCT both exhibited that value, (2) the number for which only the medical record exhibited that value, (3) the number for which only the RVCT exhibited that value, and (4) the number for which neither exhibited that value. Specifically, for each k (k = 1, ..., n), we constructed a collapsed 2 × 2 table of values
-
(i = 1, 2; j = 1, 2) according to
for each k = 1, ..., n. with a
lm
being the values in the original n × n table (l = 1, ..., n, m = 1, ...n). (Here, δ
ab
is the Kronecker delta, i.e., δ
ab
= 1 if a = b and 0 otherwise.)
for each k = 1, ..., n. with a
lm
being the values in the original n × n table (l = 1, ..., n, m = 1, ...n). (Here, δ
ab
is the Kronecker delta, i.e., δ
ab
= 1 if a = b and 0 otherwise.)