Table 2.
The PSQI global score and by components (C1–C7) according to sleep disturbances perception as a consequence of bedtime use of blue light-emitting devices.
| PSQI | All (N: 286) | Sleep disturbances perception as a consequence of bedtime use of blue light-emitting devices | ||
|---|---|---|---|---|
| Yes (N: 188) | No (N: 98) | p | ||
| PSQI global score >5 | 101 (35.3%). | 76 (26.6%) | 25 (8.7%) | 0.005 |
| PSQI mean score | 5.62 ± 2.91 | 6.45 ± 3.3 | 5.41 ± 3.11 | 0.005 |
| Component 1: subjective sleep quality | 1.70 ± 0.98 | 1.89 ± 1.12 | 1.54 ± 0.62 | 0.01 |
| Component 2: sleep latency | 0.76 ± 0.89 | 0.75 ± 0.80 | 0.76 ± 0.69 | 0.2 |
| Component 3: sleep duration | 1.45 ± 0.84 | 1.67 ± 0.62 | 1.34 ± 0.79 | 0.01 |
| Component 4: habitual sleep efficiency | 0.72 ± 0.93 | 0.74 ± 0.98 | 0.67 ± 0.92 | 0.2 |
| Component 5: sleep disturbances | 0.94 ± 0.66 | 0.99 ± 0.64 | 0.91 ± 0.65 | 0.2 |
| Component 6: use of sleeping medication | 0.18 ± 0.33 | 0.15 ± 0.30 | 0.12 ± 0.36 | 0.6 |
| Component 7: daytime dysfunction | 0.66 ± 0.79 | 0.69 ± 0.85 | 0.68 ± 0.76 | 0.005 |
| Sleep duration (hours) | 6.52 ± 1.31 | 6.3 ± 1.25 | 7.21 ± 1.23 | 0.04 |
| Sleep efficiency (%) | 87.4 ± 13.3 | 87.7 ± 13.7 | 89.8 ± 12.6 | 0.1 |
| Sleep latency (minutes) | 17.5 (9.5, 26.2) | 16.1 (11.6, 27.3) | 19.2 (8.9, 24.6) | 0.07 |
Quantitative values are expressed as means ± SD or median (interquartile lower, upper). Qualitative values are expressed as number (percentage of all students).