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Country comparison of different studies representing the MCTQ average chronotype.
| Country | MSFsc | Average age | References |
| Korea | 5.13 ± 1.54 | 27.09 ± 5.64 | Suh et al., 2018 |
| Italy | 4.75 ± 1.22 | 31.30 ± 13.00 | Ghotbi et al., 2019 |
| Portugal | 4.63 ± 1.39 | 40.40 ± 14.89 | Present study |
| Germany | 4.40 ± 1.44 | 33.91 ± 12.96 | MCTQ database |
| Japan | 4.31 ± 0.07 | 35.69 ± 11.92 | Kitamura et al., 2014 |
MSFsc and age are given for mean ± standard deviation values; the countries are ordered from late to early.
