TABLE 2.
Attrition and Retention in Electronic Health Record Data From 76 Community Health Centers With 340 Delivery Sites Across 20 States, Among Nonpregnant Adults Age 19–64 in the Accelerating Data Value Across a National Community Health Center Network Clinical Research Network, 2012–2017
| Attrition* [n (%)] | Retention† [n (%)] | ||||
|---|---|---|---|---|---|
| EHR Cohorts | No Visits in the 3-year Follow-up | Return at ≥ 1 in the 3-year Follow-up | Return in First Follow-up Year | Return in Second Follow-up Year | Return in Third Follow-up Year |
| 2012 Cohort | |||||
| Follow-up years | 2013–2015 | 2013–2015 | 2013 | 2014 | 2015 |
| All (N = 405,351) | 128,796 (31.8) | 276,555 (68.2) | 238,287 (58.8) | 191,877 (47.3) | 160,144 (39.5) |
| DM (N = 51,619) | 9210 (17.8) | 42,409 (82.2) | 40,260 (78.0) | 32,912 (63.8) | 27,250 (52.8) |
| HTN (N = 136,050) | 28,513 (21.0) | 107,537 (79.0) | 99,619 (73.2) | 80,959 (59.5) | 66,780 (49.1) |
| 2013 cohort | |||||
| Follow-up years | 2014–2016 | 2014–2016 | 2014 | 2015 | 2016 |
| All (N = 451,970) | 155,519 (34.4) | 296,451 (65.6) | 256,175 (56.7) | 202,025 (44.7) | 172,322 (38.1) |
| DM (N = 59,769) | 12,251 (20.5) | 47,518 (79.5) | 44,969 (75.2) | 35,975 (60.2) | 30,550 (51.1) |
| HTN (N = 158,470) | 37,901 (23.9) | 120,569 (76.1) | 111,727 (70.5) | 88,752 (56.0) | 75,194 (47.4) |
| 2014 cohort | |||||
| Follow-up years | 2015–2017 | 2015–2017 | 2015 | 2016 | 2017 |
| All (N = 492,549) | 169,103 (34.3) | 323,446 (65.7) | 277,039 (56.2) | 223,533 (45.4) | 192,408 (39.1) |
| DM (N = 67,420) | 14,819 (22.0) | 52,601 (78.0) | 49,545 (73.5) | 40,691 (60.4) | 35,068 (52.0) |
| HTN (N = 174,633) | 42,876 (24.6) | 131,757 (75.4) | 120,913 (69.2) | 98,855 (56.6) | 84,895 (48.6) |
Patients with at least 1 ambulatory visit in 2012, 2013, or 2014 were included in each years’ cohort. Results reported for all patients, and for those meeting diabetes mellitus (DM) or hypertension (HTN) criteria, for the 3 years following cohort-year, 2012–2017.
Attrition is the percent of patients who never had a visit in the 3 years that follow their cohort-year.
Retention is year-specific estimates of the percent of cohort patients who had at least 1 ambulatory visit in either of the follow-up years. For example, in the 2012 cohort, all patients are in the denominator for estimation of retention in 2013, 2014, and 2015. If a patient in the 2012 cohort had a visit in 2013 and 2015, the patient is in the numerator for each of those years but not in 2014 since they had no visit that year.