Table 1.
Comparison Between the A and B Groups Before Screen-Time Reduction
| Parameters | Group A (Mean ± SD) Median (Range) |
Group B (Mean ± SD) Median (Range) |
Mean Difference (Group B-Group A) (95% Confidence of Interval) | P value |
|---|---|---|---|---|
| Age | 21.56±1.16 | 21.36±1.22 | −0.2 (−0.88:0.48) | 0.56 |
| 21 (19:23) | 21 (19:23) | |||
| Sex (no. / %) | ||||
| Male | 12 (48.00%) | 11 (44.00%) | 0.78 | |
| Female | 13 (52.00%) | 14 (56.00%) | ||
| Daily screen-hours (hours): | 2.32±1.22 | 5.48±1.92 | 3.16 (2.25:4.07) | <0.0001 |
| 2 (1:5) | 5 (3:9) | |||
| Visual outcomes (logMAR): | ||||
| UDVA | 0.12±0.19 | 0.36±0.25 | 0.24 (0.11:0.36) | 0.0006 |
| 0.1 (−0.2:0.6) | 0.3 (0:0.9) | |||
| CDVA | −0.08±0.09 | 0.02±0.08 | 0.1 (0.05:0.15) | 0.0002 |
| −0.1 (−0.3:0) | 0 (−0.1:0.2) | |||
|
mfERG first examination outcomes: I- Amplitudes P1: (normal range nV/deg2) | ||||
| Ring 1 | 86.40±15.53 | 54.00±10.86 | −32.40 (−40.02:-24.78) | <0.0001 |
| R1 (66.6–130.8) | 85.32 (62.07:141.4) | 49.75 (41.72:89.14) | ||
| Ring 2 | 37.43±5.96 | 30.99±5.02 | −6.44 (−9.57:-3.30) | 0.0001 |
| R2 (30.9–77.8) | 35.75 (26.63:55.45) | 31.8 (20.15:38.69) | ||
| Ring 3 | 22.19±3.96 | 20.22±3.45 | −1.97 (−4.08:0.15) | 0.07 |
| R3 (21.7–59) | 22.35 (13.38:29.76) | 20.32 (13.48:28.63) | ||
| Ring 4 | 13.60±2.61 | 12.11±2.60 | −1.50 (−2.98:-0.02) | 0.048 |
| R4 (12.9–37.1) | 13.63 (8.95:18.92) | 11.85 (5.1:17.83) | ||
| Ring 5 | 10.97±2.32 | 8.63±1.92 | −2.34 (−3.56:-1.13) | 0.0003 |
| R5 (10–28.2) | 10.75 (7.02:15.47) | 8.18 (4.32:12.62) | ||
|
II- Amplitudes P1: (normal range nV/deg2) | ||||
| Quadrant 1 | 12.70±2.97 | 10.10±2.26 | −2.60 (−4.10:-1.10) | 0.001 |
| Q1 (15.8–42.74) | 12.09 (7.48:19.01) | 10.1 (5.05:14.16) | ||
| Quadrant 2 | 15.68±2.44 | 13.31±2.70 | −2.36 (−3.82:-0.90) | 0.002 |
| Q2 (15.98–42.75) | 16.22 (10.17:18.71) | 13.21 (6.44:20.18) | ||
| Quadrant 3 | 16.22±2.77 | 14.40±3.17 | −1.82 (−3.51:-0.13) | 0.05 |
| Q3 (15.18–42.05) | 15.42 (12.66:21.13) | 13.85 (4.89:19.43) | ||
| Quadrant 4 | 11.82±2.50 | 9.79±2.50 | −2.04 (−3.46:-0.61) | 0.006 |
| Q4 (13.87–39.61) | 11.35 (7.97:16.65) | 10.59 (3.26:13.45) | ||
Abbreviations: UDVA, uncorrected visual acuity; CDVA, uncorrected visual acuity; logMAR, logarithm of minimal angle of resolution; Amplitudes P1, amplitude density of the first foveal peak; deg, degree; nV, nanovolts; R1 to R5, Ring 1 to Ring 5; Q1 to Q4, Quadrant 1 to Quadrant 4; SD, standard deviation.