Table 5.
Probability of having poor sleep quality in the three cities by sex.
| City | PSQI < 5 Points | PSQI ≥ 5 Points | p-Value | OR Girls vs. Boys | ||
|---|---|---|---|---|---|---|
| Boys | Girls | Boys | Girls | |||
| Total | 56% | 47% | 44% | 53% | <0.001 * | 1.20 (1.09–1.33) |
| Seville | 54% | 45% | 46% | 55% | 0.010 * | 1.19 (1.04–1.35) |
| Reykjavik | 62% | 54% | 38% | 46% | 0.181 | 1.17 (0.95–1.45) |
| Tartu | 54% | 43% | 46% | 57% | 0.047 * | 1.26 (1.01–1.58) |
* Statistically significant differences at p < 0.05. PSQI = Pittsburgh Sleep Quality Index; PSQI < 5 points = good quality; PSQI ≥ 5 points = poor quality (high sleep latency, sleep disturbances and daytime dysfunction).