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Table 2 PSQI items as a function of the BDI-II score

From: The association of sleep patterns and depressive symptoms in medical students: a cross-sectional study

  BDI-II ≤ 13; n (%) BDI-II > 13; n (%) Mean difference; % (95% CI)
Sleep quality (n = 1096)
 Very good* 172 (93.5) 12 (6.5)  
 Fairly good 610 (86.5) 95 (13.5) 7 (1.9–10.9)
 Fairly poor 104 (53.6) 90 (46.4) 39.9 (31.7–47.4)
 Very poor 3 (23.1) 10 (76.9) 70.4 (42.8–85.6)
Sleep latency in minutes (n = 1097)
  ≤ 15* 530 (89.7) 61 (10.3)  
 16–30 261 (78.4) 72 (21.6) 11.3 (6.4–16.5)
 31–60 77 (60.2) 51 (39.8) 29.5 (21–38.4)
  ≥ 61 22 (48.9) 23 (51.1) 41.2 (26.8–55.3)
Sleep durationin hours (n = 1091)
  ≥ 7* 688 (85.9) 113 (14.1)  
 6 160 (72.4) 61 (27.6) 13.5 (7.4–20.1)
 5 34 (57.6) 25 (42.4) 28.3 (16.3–41.2)
  ≤ 4 4 (40.0) 6 (60.0) 45.9 (17.1–69.2)
Sleep efficiency in % (n = 1091)
  ≥ 85* 703 (85.0) 124 (15.0)  
 75–84 141 (72.3) 54 (27.7) 12.7 (6.3–19.7)
 65–74 34 (63.0) 20 (37.0) 22 (10.1–35.5)
  ≤ 64 8 (53.3) 7 (46.7) 31.7 (9.7–55)
Sleep disturbancesin events (n = 1072)
 None* 72 (92.3) 6 (7.7)  
 1–9 761 (83.6) 149 (16.4) 8.7 (0.3–13.5)
 10–18 40 (48.8) 42 (51.2) 43.5 (30.1–54.8)
 19–27 2 (100) 92.3 (26–96.4)
Sleeping pill consumptionper week (n = 1094)
 None* 862 (83.3) 173 (16.7)  
  < 1× per week 16 (51.6) 15 (48.4) 31.7 (15.1–48.6)
 1–2× per week 8 (47.1) 9 (52.9) 36.2 (14.1–57.2)
  ≥ 3× per week 1 (9.1) 10 (90.9) 74.2 (45.5–82)
Daytime drowsinessin days (n = 1090)
 None* 218 (97.3) 6 (2.7)  
 1–2 505 (86.9) 76 (13.1) 10.4 (6.5–13.7)
 3–4 150 (62.0) 92 (38.0) 35.3 (28.7–41.7)
 5–6 12 (27.9) 31 (72.1) 69.4 (54.3–80.7)
  1. *Reference group