Sleep features

n (%)

Sleep Quality

Very poor

Poor

Fairly

Good

Very good

3.9 ± 0.6

0 0

5 4.6

45 41.3

53 48.6

6 5.5

Sleep duration (hours)

>7

6 - 6.9

5 - 5.9

<5

66 59.5

40 36.0

5 4.5

0 0

Smartphone use (hours)

0 - 0.9

1 - 1.9

2 - 2.9

>3

1.6 ± 1.3

37 33.3

37 33.3

24 21.7

13 11.7