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Table 1 Descriptive characteristics of study participants

From: Daylight saving time as a potential public health intervention: an observational study of evening daylight and objectively-measured physical activity among 23,000 children from 9 countries

  

N (%) participants

N (%) valid days

Full sample

 

23,188 (100%)

158,784 (100%)

Sex

Male

8819 (38%)

62,745 (40%)

 

Female

14,369 (62%)†

96,039 (60%)

Age

5-6 years

1800 (8%)

7855 (5%)

 

7-8 years

711 (3%)

4963 (3%)

 

9-10 years

5769 (25%)

30,702 (19%)

 

11-12 years

9616 (41%)

61,352 (39%)

 

13-14 years

4206 (18%)

46,530 (29%)

 

15-16 years

1086 (5%)

7382 (5%)

Country [No. studies]

Australia [N = 2]

2459 (11%)

18,679 (12%)

Brazil [N = 1]

453 (2%)

1577 (1%)

Denmark [N = 2]

2031 (9%)

11,030 (7%)

England [N = 4]

10,284 (44%)

83,420 (53%)

Estonia [N = 1]

656 (3%)

2537 (2%)

Madeira [N = 1]

1214 (5%)

4899 (3%)

Norway [N = 1]

384 (2%)

1459 (1%)

Switzerland [N = 1]

404 (2%)

2569 (2%)

United States [N = 2]

5303 (23%)

32,614 (21%)

Weight status

Normal/underweight

17,573 (76%)

121,350 (76%)

Overweight

4116 (18%)

27,967 (18%)

Obese

1499 (6%)

9467 (6%)

Mother’s education

Up to high school

7422 (48%)

54,547 (48%)

College/vocational

2656 (17%)

19,352 (17%)

 

University level

5251 (34%)

38,723 (34%)

  1. For individuals measured more than once, the first column gives age and weight status at baseline while the second column gives age and weight status during the measurement period in question. Numbers add up to less than the total for mother’s education because this variable was only collected in 11 of the 15 studies, and was also subject to some missing data within those 11 studies (see Additional file 1: Tables A1 and A2). †Proportion of girls 52% after excluding one large American study that measured girls only.
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International Journal of Behavioral Nutrition and Physical Activity

ISSN: 1479-5868

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