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Table 2 Comparisons of sleep characteristics and health-related quality of life between weekday total sleep time

From: The impact of sleep–wake problems on health-related quality of life among Japanese nursing college students: a cross sectional survey

 

 < 6 h

6–7 h

 ≥ 7 h

P value

N

58

39

53

 

Third grade/Fourth grade

35/23

14/25

13/40

 < 0.001

PSQI, median (IQR)

6.0 (5.0–8.0)

5.0 (3.5–6.5)

4.0 (2.0–6.0)

 < 0.001

 PSQI ≥ 6, N (%)

38 (65.5)

16 (41.0)

18 (34.0)

0.002

Evening Chronotype, N (%)

47 (81.0)

21 (53.8)

32 (60.4)

0.009

ISI, median (IQR)

5.0 (3.0–8.0)

6.0 (2.5–9.0)

4.0 (1.0–8.0)

0.35

 ISI ≥ 8, N (%)

16 (27.6)

12 (30.8)

15 (28.3)

0.95

 SI ≥ 10, N (%)

9 (15.5)

7 (17.9)

7 (13.2)

0.78

 Difficulty initiating sleep, N (%)

8 (13.8)

6 (15.4)

10 (18.9)

0.78

 Difficulty maintaining sleep, N (%)

2 (3.4)

2 (5.1)

2 (3.8)

1

 Early waking, N (%)

3 (5.2)

1 (2.6)

2 (3.8)

0.88

Weekday TST hr, median (IQR)

5.39 (4.83–5.67)

6.42 (6.00–6.50)

7.75 (7.17–8.33)

 < 0.001

Weekend TST hr, median (IQR)

7.83 (6.50–8.96)

7.83 (7.00–8.83)

8.50 (7.75–9.42)

0.03

 < 6 h, N (%)

7 (12.1)

1 (2.6)

4 (7.5)

0.003

 6–7 h, N (%)

13 (22.4)

7 (17.9)

1 (1.9)

 

 ≥ 7 h, N (%)

38 (65.5)

31 (79.5)

48 (90.6)

 

Catch-up sleep, median (IQR)

3.00 (1.00–4.13)

1.50 (0.50–2.17)

0.50 (0.00–1.50)

 < 0.001

 ≥ 2 h, N (%)

39 (67.2)

15 (38.5)

6 (11.3)

 < 0.001

SF8

 Physical functioning, median (IQR)

54.3 (54.3–54.3)

54.3 (54.3–54.3)

54.3 (54.3–54.3)

0.05

 Role physical, median (IQR)

54.9 (47.8–54.9)

54.9 (45.7–54.9)

54.9 (54.9–54.9)

0.03

 Bodily pain, median (IQR)

59.1 (51.3–59.1)

59.1 (51.3–59.1)

59.1 (51.3–59.1)

0.87

 General health, median (IQR)

52.7 (43.0–52.7)

52.7 (52.7–60.0)

52.7 (52.7–60.0)

0.06

 Vitality, median (IQR)

55.5 (47.4–55.5)

55.5 (47.4–55.5)

55.5 (47.4–55.5)

0.40

 Social functioning, median (IQR)

55.2 (47.3–55.2)

55.2 (47.3–55.2)

55.2 (47.3–55.2)

0.59

 Role emotional, median (IQR)

49.0 (43.7–55.2)

49.0 (49.0–55.2)

49.0 (49.0–55.2)

0.13

 Mental health, median (IQR)

45.1 (38.3–51.2)

51.2 (45.1–51.2)

51.2 (45.1–56.7)

0.02

 PCS, median (IQR)

53.8 (51.7–55.5)

52.1 (48.6–55.5)

54.6 (51.5–56.2)

0.38

 MCS, median (IQR)

46.3 (40.2–51.7)

48.7 (45.9–54.2)

50.0 (44.7–54.5)

0.04

  1. IQR interquartile range, ISI Insomnia severity index, MCS Mental component summary, PCS Physical component summary, PSQI Pittsburgh sleep quality index, TST total sleep time
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Health and Quality of Life Outcomes

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