Table 1.
Demographic factors and baseline clinical characteristics of the study population
| Seattle | Atlanta | Total | |
|---|---|---|---|
| Patients, n | 13,439 | 10,285 | 23,724 |
| Age (years) | |||
| Mean (SD) | 62.20 (10.91) | 63.46 (10.14) | 62.75 (10.60) |
| Range | 21–97 | 24–98 | 21–98 |
| Male sex | 12,724 (94.68) | 9,795 (95.24) | 22,519 (94.92) |
| Race | |||
| White | 9,482 (70.56) | 4,678 (45.48) | 14,160 (59.69) |
| African American | 1,642 (12.22) | 5,085 (49.44) | 6,727 (28.35) |
| Asian | 383 (2.85) | 34 (0.33) | 417 (1.76) |
| Other | 605 (4.50) | 90 (0.88) | 695 (2.93) |
| Unknown | 1,327 (9.87) | 398 (3.87) | 1,725 (7.27) |
| Encounters, n | 21,797 | 13,104 | 34,901 |
| Retinopathy grade | |||
| No DR | 15,270 (70.05) | 11,166 (85.21) | 26,436 (75.75) |
| Mild NPDR | 2,364 (10.85) | 957 (7.31) | 3,321 (9.51) |
| Moderate NPDR | 494 (2.27) | 311 (2.37) | 805 (2.31) |
| Severe NPDR | 110 (0.50) | 153 (1.17) | 263 (0.75) |
| PDR | 22 (0.10) | 193 (1.47) | 215 (0.62) |
| Ungradable | 3,537 (16.23) | 324 (2.47) | 3,861 (11.06) |
| Images, n | 199,142 | 112,462 | 311,604 |
Data are n (%) unless otherwise indicated.