Table 1 Demographic and sleep characteristics

N

150

Age years, median (IQR)

22 (21–22)

Third grade/Fourth grade

62/88

Women, N (%)

142 (94.7)

Living alone, N (%)

100 (66.7)

Non-breakfast eater, N (%)

37 (24.7)

Night snacker, N (%)

65 (43.3)

Smoking

 Never, N (%)

143 (95.3)

 Present, N (%)

3 (2.0)

 Ex-smoker, N (%)

4 (2.7)

Habitual drinking, N (%)

22 (14.7)

Regular physical exercise, N (%)

28 (18.7)

Cell-phone use in bed, N (%)

136 (90.7)

PSQI, median (IQR)

5.0 (4.0–7.0)

 PSQI ≥ 6, N (%)

72 (48.0)

Evening Chronotype, N (%)

100 (66.7)

ISI, median (IQR)

5.0 (2.0–8.0)

 ISI ≥ 8, N (%)

43 (28.7)

 ISI ≥ 10, N (%)

23 (15.3)

Weekday TST hr, median (IQR)

6.33 (5.50–7.31)

 < 6 h, N (%)

58 (38.7)

 6–7 h, N (%)

39 (26.0)

 ≥ 7 h, N (%)

53 (35.3)

Weekend TST hr, median (IQR)

8.00 (7.00–9.00)

 < 6 h, N (%)

12 (8.0)

 6–7 h, N (%)

21 (14.0)

 ≥ 7 h, N (%)

117 (78.0)

Catch-up sleep, median (IQR)

1.50 (0.50–2.75)

 ≥ 2 h, N (%)

60 (40.0)