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Table 1 Sleep habits shown as means (hh:mm/day) and standard deviations (SD) among Finnish school-aged children (n = 337–353)†

From: Do computer use, TV viewing, and the presence of the media in the bedroom predict school-aged children’s sleep habits in a longitudinal study?

 

2006

 

2008

 

∆ 2006–2008

 

4th and 5th graders

5th and 6th graders

  

Girls (n = 177–181) †

mean

SD

mean

SD

mean

SD

Bedtime school day

21:29

0:37

21:48

0:37

0:23***

0:36

Wake-up time school day

7:10

0:26

7:01

0:25

−0:10***

0:30

Bedtime weekend

22:18

0:48

22:44

0:48

0:26***

0:47

Wake-up time weekend

8:42

0:53

9:08

0:59

0:27***

0:52

Discrepancy of bedtimes

0:53

0:35

0:56

0:38

0:04

0:42

Sleep duration school day

9:48

0:40

9:13

0:43

−0:32***

0:46

Sleep duration weekend

10:24

0:57

10:24

1:00

0:01

1:04

Discrepancy in sleep duration

0:39

0:58

1:12

1:00

0:33***

1:07

Boys (n = 159–172) †

      

Bedtime school day

21:24

0:41

21:41

0:39

0:18***

0:39

Wake-up time school day

7:06

0:30

7:07

0:25

0:00

0:35

Bedtime weekend

22:24

0:50

22:51

0:59

0:27***

0:48

Wake-up time weekend

8:27

1:08

8:54

1:10

0:27***

1:01

Discrepancy of bedtimes

1:01

0:41

1:11

0:47

0:09*

0:47

Sleep duration school day

9:42

0:48

9:25

0:44

−0:18***

0:48

Sleep duration weekend

10:03

1:12

10:03

1:08

0:00

1:15

Discrepancy in sleep duration

0:20

1:13

0:37

1:08

0:18**

1:13

All (n = 337–353) †

      

Bedtime school day

21:25

0:39

21:48

0:38

0:20***

0:37

Wake-up time school day

7:08

0:28

7:03‡

0:25

−0:05**

0:32

Bedtime weekend

22:21

0:49

22:48

0:54

0:26***

0:47

Wake-up time weekend

8:35‡

1:01

9:01‡

1:05

0:27***

0:57

Discrepancy of bedtimes

0:57

0:38

1:04‡‡

0:44

0:06*

0:44

Sleep duration school day

9:43

0:44

9:19‡‡

0:44

−0:25***

0:47

Sleep duration weekend

10:14‡‡

1:05

10:14‡‡

1:05

0:00

1:10

Discrepancy in sleep duration

0:30‡‡

1:06

0:55‡‡‡

1:06

0:26***

1:10

  1. † Range of respondents in the analyses.
  2. Difference between study years *** ≤0.001, **≤0.01 *≤0.05, paired sample t-test.
  3. Difference between gender within years ‡‡‡≤0.001, ‡‡≤0.01, ‡≤0.05, independent-samples t-test.