Table 2.
Descriptive statistics according to chronotype and Pearson correlations between rMEQ score and sleep mid-point (MCTQ) and sleep quality (PSQI) scores.
| Definite evening | Moderate evening | Intermediate | Moderate morning | Definite morning | rMEQ score | ||
|---|---|---|---|---|---|---|---|
| n = 1 | n = 13 | n = 21 | n = 11 | n = 9 | r | p | |
| MSW | NA | 4:05 (0:54) | 3:29 (0:58) | 3:00 (0:53) | 2:24 (1:20) | −0.49 | <0.001 |
| MSF | NA | 4:26 (1:08) | 4:03 (1:25) | 3:33 (0:56) | 2:47 (1:32) | −0.39 | 0.006 |
| MSFSC | NA | 4:25 (1:07) | 3:50 (1:19) | 3:28 (0:54) | 2:32 (1:32) | −0.43 | 0.002 |
| PSQI Global | NA | 9.8 (3.8) | 7.6 (4.4) | 6.9 (4.3) | 4.4 (1.8) | −0.39 | 0.007 |
rMEQ, reduced Morningness–Eveningness Questionnaire; MCTQ, Munich ChronoType Questionnaire; MSW, Mid-sleep on work days; MSF, Mid-sleep on free days; MSFSC, Mid-sleep on free days corrected for sleep debt on work days; PSQI, Pittsburgh Sleep Quality Index; NA, Not available, study participant was an extreme outlier and thus MCTQ and PSQI data were excluded from the analysis.