Table 2 Description of the study sample, according to sleep deprivation groups, from Sleep Deprivation Index
|  | Q1 (N = 536) ≤ 2 h | Q2-Q3 (N = 564) 3 and 4 h | Q4 (N = 238) >  4 h | Total (N = 1338) |
|---|---|---|---|---|
Age (mean ± SD) | 23.0 ± 3.0 | 22.5 ± 2.9 | 22.6 ± 3.0 | 22.7 ± 3.0 |
Year of medical school (N (%)) | ||||
 1st/2nd (Basic) | 175 (32.6%) | 196 (34.8%) | 83 (34.9%) | 454 (33.9%) |
 3rd/4th (Clinical) | 195 (36.4%) | 209 (37.1%) | 81 (34.0%) | 485 (36.2%) |
 5th/6th (Clerkship) | 166 (31.0%) | 159 (28.2%) | 74 (31.1%) | 399 (29.8%) |
 Female sex - N (%) | 276 (51.5%) | 304 (53.9%) | 131 (55.0%) | 711 (53.1%) |
WHOQOL (median [P25 - P75]) | ||||
 Physical | 71.4 [60.7–78.6] | 64.3 [57.1–75.0] | 60.7 [46.4–71.4] | 67.9 [53.6–75.0] |
 Psychological | 66.7 [54.2–75.0] | 62.5 [54.2–70.8] | 58.3 [45.8–66.7] | 62.5 [54.2–75.0] |
 Social Relationships | 66.7 [58.3–75.0] | 66.7 [50.0–75.0] | 58.3 [50.0–75.0] | 66.7 [50.0–75.0] |
 Environment | 65.6 [56.3–75.0] | 65.6 [53.1–75.0] | 59.4 [50.0–68.8] | 65.6 [53.1–75.0] |
VERAS-Q (median [P25 - P75]) | ||||
 Time use | 39.8 [29.6–52.3] | 36.4 [25.0–45.5] | 29.6 [20.4–40.9] | 36.4 [25.0–47.7] |
 Psychological | 54.2 [43.8–66.7] | 50.0 [39.6–60.4] | 43.8 [33.3–54.2] | 50.0 [39.6–62.5] |
 Physical  Environment | 59.4 [43.8–71.9] 58.9 [50.0–67.9] | 53.1 [40.6–65.6] 57.1 [49.5–66.1] | 46.9 [34.4–59.4] 55.4 [46.4–62.5] | 53.1 [40.6–68.8] 57.1 [48.2–66.1] |
Quality of life (median [P25 - P75]) | ||||
 Overall | 8.0 [7.0–9.0] | 8.0 [7.0–9.0] | 8.0 [7.0–9.0] | 8.0 [7.0–9.0] |
 Medical school-related | 7.0 [6.0–8.0] | 7.0 [6.0–7.0] | 6.0 [5.0–7.0] | 7.0 [6.0–8.0] |
Mental symptoms (median [P25 - P75]) | ||||
 Depression (BDI) | 7.0 [3.0–11.0] | 8.0 [5.0–13.0] | 11.0 [7.0–17.0] | 8.0 [4.0–13.0] |
 Anxiety-state | 41.0 [34.0–50.0] | 42.0 [35.0–51.0] | 47.0 [40.0–57.0] | 43.0 [35.0–52.0] |
 Anxiety-trait | 43.0 [34.0–50.0] | 46.0 [37.8–53.0] | 50.0 [41.2–59.0] | 45.0 [37.0–53.0] |
DREEM (median [P25 - P75]) | ||||
 Perceptions of learning | 28.5 [23.0–33.0] | 28.0 [23.0–33.0] | 26.0 [22.0–32.0] | 28.0 [23.0–33.0] |
 Perception of teachers | 28.0 [23.0–32.0] | 28.0 [24.0–33.0] | 27.0 [23.0–31.0] | 28.0 [23.0–32.0] |
 Perceptions of the atmosphere | 20.0 [16.0–23.0] | 19.0 [16.0–23.0] | 17.5 [14.2–21.0] | 19.0 [15.2–22.0] |
 Academic self-perceptions | 31.0 [25.0–36.0] | 30.5 [25.0–35.0] | 28.0 [23.0–33.0] | 30.0 [25.0–35.0] |
 Social self-perceptions | 16.0 [13.0–20.0] | 16.0 [13.0–18.2] | 14.0 [11.0–17.0] | 16.0 [13.0–19.0] |
 Global | 123.5 [102.8–142.0] | 121.0 [101.8–139.0] | 113.0 [98.0–128.8] | 120.0 [101.0–139.0] |