Table 3.
The Numbers of and Reasons that Contribute to False-Negative Subjects.
| Time Frame of EMR Data | FN Subjects, No. | Missing Diagnosis Codes for T2DM, No. (%) | Missing Prior Abnormal Laboratory Reports, No. (%) | Missing Use History of DM-Related Meds or Supplies, No. (%) | |
|---|---|---|---|---|---|
| Case | 2007 (1 yr) | 681 | 384 (56) | 137 (20) | 160 (23) |
| 2006–2007 (2 yrs) | 404 | 197 (49) | 128 (32) | 79 (20) | |
| 2005–2007 (3 yrs) | 304 | 133 (44) | 122 (40) | 49 (16) | |
| 2004–2007 (4 yrs) | 220 | 89 (40) | 103 (47) | 28 (13) | |
| 2003–2007 (5 yrs) | 154 | 56 (36) | 80 (52) | 18 (12) | |
| 2002–2007 (6 yrs) | 120 | 42 (35) | 64 (53) | 14 (12) | |
| 2001–2007 (7 yrs) | 78 | 27 (35) | 44 (56) | 7 (9) | |
| 2000–2007 (8 yrs) | 49 | 16 (33) | 29 (59) | 4 (8) | |
| 1999–2007 (9 yrs) | 27 | 9 (33) | 18 (67) | 0 (0) | |
| 1998–2007 (10 yrs) | 15 | 5 (33) | 10 (67) | 0 (0) | |
|
| |||||
| Time Frame of EMR Data | FN Subjects, No. | Absence of Enough Face-to-Face Visits, No. (%) | Missing Prior Laboratory Reports, No. (%) | ||
|
| |||||
| Control | 2007 (1 yr) | 14119 | 2866 (20) | 11253 (80) | |
| 2006–2007 (2 yrs) | 10057 | 629 (6) | 9428 (94) | ||
| 2005–2007 (3 yrs) | 7653 | 343 (4) | 7310 (96) | ||
| 2004–2007 (4 yrs) | 5921 | 193 (3) | 5728 (97) | ||
| 2003–2007 (5 yrs) | 4421 | 120 (3) | 4301 (97) | ||
| 2002–2007 (6 yrs) | 3317 | 86 (3) | 3231 (97) | ||
| 2001–2007 (7 yrs) | 2399 | 60 (3) | 2339 (98) | ||
| 2000–2007 (8 yrs) | 1641 | 35 (2) | 1606 (98) | ||
| 1999–2007 (9 yrs) | 1037 | 19 (2) | 1018 (98) | ||
| 1998–2007 (10 yrs) | 481 | 7 (1) | 474 (99) | ||
Abbreviations: DM, diabetes mellitus; EMR, electronic medical record; FN, false-negative; T2DM, type 2 diabetes mellitus.