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Table 1 Characteristics of participants by cohort studies

From: Tracking of accelerometry-measured physical activity during childhood: ICAD pooled analysis

 

Avon Longitudinal Study of Parents and Children (ALSPAC)

Children Living in Active Neighourhoods (CLAN)

Healthy Eating and Play Study (HEAPS)

Iowa Bone Development Study (IBDS)

Personal and Environmental Associations with Children’s Health (PEACH)

Country

United Kingdom

Australia

Australia

United States

United Kingdom

Source population

Birth cohort recruited from a Bristol health district

Students in Melbourne public schools

Students in Melbourne public and catholic schools

Birth cohort recruited from Iowa hospitals

Students in Bristol public schools

Accelerometry data files, a follow-up/baseline, n (%)

4102/6085 (67%)

511/1162 (44%)

327/1390 (24%)

456/528 (86%)

889/1269 (70%)

Sample, b n

3324

444

259

415

579

Compliance rate, c %

81

87

79

91

65

Gender

     

Boys, %

46.8

47.5

52.1

50.1

41.6

Girls, %

53.2

52.5

47.9

49.9

58.4

Data collection months

    

Baseline

All

Jul-Dec

Feb-Nov

Sep-Nov

Sep-Jul

Follow-up

All

Jul-Nov

May-Nov

Sep-Nov

Oct-Jul

  

Median (interquartile)

 

Follow-up duration, years

2.1 (2.0, 2.3)

3.0 (2.9, 3.0)

3.0 (3.0, 3.1)

2.0 (2.0, 2.0)

1.1 (1.0, 1.1)

Ages, years

     

Baseline

11.7 (11.6, 11.8)

10.9 (6.3, 11.6)

6.4 (5.8, 10.9)

11.0 (10.9, 11.2)

10.9 (10.6, 11.2)

Follow-up

13.8 (13.8, 13.9)

13.9 (9.2, 14.6)

9.6 (9.0, 13.9)

13.0 (12.9, 13.2)

12.0 (11.7, 12.3)

Height, m

     

Baseline

1.50 (1.46, 1.55)

1.42 (1.20, 1.51)

1.24 (1.16, 1.44)

1.49 (1.43, 1.54)

1.45 (1.40, 1.50)

Follow-up

1.63 (1.58, 1.68)

1.60 (1.39, 1.68)

1.44 (1.34, 1.62)

1.62 (1.56, 1.66)

1.51 (1.46, 1.57)

Weight, kg

     

Baseline

41.4 (36.2, 48.6)

35.5 (23.7, 43.8)

27.0 (21.7, 37.7)

41.8 (35.2, 51.0)

37.0 (33.0, 44.0)

Follow-up

52.6 (46.8, 60.2)

51.1 (35.3, 61.1)

41.0 (31.7, 53.6)

53.7 (45.4, 64.1)

42.8 (37.6, 50.8)

Accelerometer wear days

    

Baseline

7 (6, 7)

6 (5, 6)

5 (4, 6)

5 (4, 5)

5 (4, 6)

Follow-up

6 (5, 7)

6 (5, 6)

5 (4, 6)

5 (4, 5)

5 (4, 6)

Accelerometer wear time, hours/day

    

Baseline

13.3 (12.8, 13.8)

13.1 (12.4, 13.9)

12.7 (12.0, 13.5)

12.8 (12.5, 13.5)

13.0 (12.4, 13.6)

Follow-up

13.5 (12.8, 14.1)

13.6 (12.9, 14.2)

13.2 (12.4, 13.9)

13.1 (12.6, 13.8)

13.3 (12.6, 14.0)

MVPA, minutes/day

    

Baseline

52.3 (37.1, 70.9)

61.2 (47.7, 78.2)

67.4 (48.8, 88.7)

45.6 (32.6, 63.8)

43.3 (30.9, 57.7)

Follow-up

48.5 (33.3, 68.8)

59.1 (43.1, 79.0)

49.0 (33.8, 68.7)

40.0 (25.2, 57.3)

45.5 (32.2, 62.1)

VPA, minutes/day

    

Baseline

13.0 (7.6, 22.1)

17.2 (11.0, 26.0)

17.6 (10.8, 28.0)

12.4 (6.4, 22.6)

8.2 (4.5, 14.0)

Follow-up

14.0 (7.2, 24.4)

19.3 (11.4, 33.0)

11.3 (6.0, 19.2)

10.2 (5.0, 18.3)

8.0 (3.8, 14.2)

  1. MVPA, moderate- to vigorous-intensity physical activity; VPA, vigorous-intensity physical activity.
  2. aThe number of accelerometry data files at follow-up was obtained from the number of participants who had accelerometry data files at follow-up among those who had accelerometry data files at baseline in the ICAD dataset.
  3. bSample size was the number of participants who had age, gender, and valid accelerometry data (≥ 10 hours/day and ≥ 3 wear days) at both baseline and follow-up.
  4. cCompliance rate was calculated as sample size divided by the number of participants who had accelerometry data files at both baseline and follow-up.
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International Journal of Behavioral Nutrition and Physical Activity

ISSN: 1479-5868

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