Table 2 Characteristics of patients and tumors in matched subgroups. SD, standard deviation. IQR, interquartile range
|  | Iris melanomas (n = 39) | Choroidal melanomas (n = 43) | p |
|---|---|---|---|
Patient age at diagnosis, mean (SD) | 58 (17) | 63 (13) | 0.20 |
Tumor diameter, mean (SD) | 5.3 (2.9) | 5.3 (1.0) | 0.93 |
Tumor thickness, mean (SD) | 2.8 (0.8) | 2.6 (0.3) | 0.34 |
Ciliary body involvement, n (%) | 2 (5) | 1 (2) | 0.60 |
Presenting symptoms, n (%) | |||
 Blurred vision or decreased visual acuity | 6 (15) | 13 (30) | 0.21 |
 Shadow in visual field | 0 (0) | 10 (23) | 0.004 |
 Flashes and/or floaters | 0 (0) | 3 (7) | 0.25 |
 Metamorphopsia | 0 (0) | 0 (0) | 1.0 |
 Ocular pain | 0 (0) | 0 (0) | 1.0 |
Median follow up for survivors, years (IQR) | 14.0 (14.5) | 15.2 (13.9) | 0.54 |