Smokers

Non-smokers

Mann-Whitney U-test

z

P

WD Bedtime

24.9 ± 1.2

(68)

24.5 ± 1.2

(1286)

−2.304

0.021

WE Bedtime

25.9 ± 1.5

(67)

25.2 ± 1.5

(1312)

−3.749

<0.001

WD Wake up time

7.8 ± 1.0

(70)

7.3 ± 0.9

(1406)

−4.880

<0.001

WE Wake up time

10.4 ± 2.2

(69)

9.4 ± 1.7

(1411)

−1.478

<0.001

WD Sleep hours

6.9 ± 1.2

(68)

6.7 ± 1.2

(1278)

−1.975

0.048

WE Sleep hours

8.6 ± 1.7

(67)

8.2 ± 1.6

(1311)

−2.511

0.012