Table 1. RP subjects' characteristics: photopsias frequency across test sessions.
| Frequency <20% (n=12) | Frequency >20% (n=24) | Total (n=36) | P-value | |
|---|---|---|---|---|
| Demographics | ||||
| Gender—% male | 16.7 | 66.7 | 50 | 0.005* |
| Age in years—mean (SD) | 54.5 (17.7) | 49.1 (13.4) | 50.8 (14.9) | 0.36 |
| Psychosocial variables: mean (SD) | ||||
| Perceived Stress Scale score (PSS) | 18.1 (2.7) | 22.4 (5.1) | 21.0 (4.8) | 0.002* |
| Positive Mood score (PANAS) | 34.4 (6.4) | 26.7 (7.2) | 29.3 (7.8) | 0.003* |
| Negative Mood score (PANAS) | 13.3 (2.6) | 16.0 (5.0) | 15.1 (4.5) | 0.04* |
| Epworth Sleepiness Scale score (ESS) | 12.4 (3.3) | 13.6 (3.8) | 13.2 (3.6) | 0.32 |
| Stanford Sleepiness Scale score (SSS) | 2.2 (0.8) | 2.5 (0.7) | 2.4 (0.8) | 0.34 |
| Beck Depression Inventory score (BDI) | 5.8 (4.2) | 11.6 (9.6) | 10.0 (8.8) | 0.03* |
| Vision: mean (SD) | ||||
| ETDRS VA OU (logMAR) | 0.28 (0.45) | 0.21 (0.27) | 0.24 (0.34) | 0.63 |
| Pelli–Robson CS OU (log units) | 1.30 (0.67) | 1.30 (0.59) | 1.30 (0.61) | 0.97 |
| GVF diameter (V4e; degrees) | 47.1 (50.3) | 48.1 (48.1) | 47.8 (48.1) | 0.96 |
*
Statistically significant (P<0.05)