Table 1.
Demographics, caffeine and cigarette consumption, chronotype, sleep behavior, and performance on the VAT
| Characteristic | Mean (SD) |
|---|---|
| Age (years) | 43.95 (13.57) median: 43, Range 21–73 |
| Gender | 30 female, 26 male |
| Caffeine use (mg/d) | 75 (117.63) |
| Cigarette use (pack/y) | 0.77 (3.52) median: 0, Range 0–21 |
| MEQ | 59% neither type, 27% moderate M type, 7% definite M type, 4% moderate E type |
| BDI | 1.24 (2.35) |
| Sleep duration per night (h) | 6.91 (1.24) |
| Sleep duration WE (h) | 7.31 (1.42) |
| Sleep duration WD (h) | 6.74 (1.46) |
| Sleep duration (WE–WD) (h) | 0.59 (1.66) |
| Bedtime per night (o’clock) | 11:30 pm (1.65 h) |
| Wake up time per night (o’clock) | 6:24 am (1.74 h) |
| Bedtime WE (o’clock) | 12:21 am (2.01 h) |
| Wake up time WE (o’clock) | 7:41 am (1.81 h) |
| Bedtime WD (o’clock) | 11:10 pm (1.73 h) |
| Wake up time WD (o’clock) | 5:54 am (2.04 h) |
| Sleep midpoint per night (o’clock) | 3:24 am (1.26 h) |
| Sleep midpoint WE (o’clock) | 4:00 am (1.78 h) |
| Sleep midpoint WD (o’clock) | 2:53 am (1.15 h) |
| Sleep midpoint (WE–WD) (h) | 1.11 (1.38) |
| VAT (2-ball) RT (s) | 0.93 (0.26) |
| VAT (3-ball) RT (s) | 0.90 (0.34) |
| VAT (4-ball) RT (s) | 0.96 (0.36) |
| VAT (2-ball) Hits% | 92.94 (11.88) median:100, Range: 46.67–100 |
| VAT (3-ball) Hits% | 88.05 (16.24) median: 93.33, Range: 26.67–100 |
| VAT (4-ball) Hits% | 80.13 (18.88) median 86.67, Range: 40.00–100 |
| Day of scans (% of participants) | Mon: 20%, Tue: 30%, Wed: 5%, Thurs: 43%, Fri:2% |
| Days (Actimetry-Scan) | 7.48 (16.03) |
MEQ, Morningness Eveningness Questionnaire; M type, morning type; E type, evening type; BDI, the Beck Depression Inventory; RT, reaction time; Days (Actimetry-Scan), days passed between actimetry assessment and scans (positive value: actimetry assessment preceded scans; negative value: actimetry assessment followed scans).