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Table 1 Descriptive characteristics of study participants

From: Objectively measured physical activity and sedentary time in youth: the International children’s accelerometry database (ICAD)

   N (%) participants N (%) measured time points
Full sample   27,637 (100 %) 35,360 (100 %)
Sex Male 11,199 (41 %) 14,633 (41 %)
Female 16,438 (59 %) 20,727 (59 %)
Age† 2–4 years 1044 (4 %) 1044 (3 %)
5–6 years 2379 (9 %) 2379 (7 %)
7–8 years 1168 (4 %) 1654 (5 %)
9–10 years 6054 (22 %) 6910 (20 %)
11–12 years 9981 (36 %) 11,186 (32 %)
13–14 years 4706 (17 %) 9196 (26 %)
15–16 years 1747 (6 %) 2342 (7 %)
17–18 years 558 (2 %) 649 (2 %)
Weight
status† ‡
Normal 20,387 (74 %) 26,222 (75 %)
Overweight 4939 (18 %) 6238 (18 %)
Obese 2048 (7 %) 2450 (7 %)
Country
[No.
studies]
Australia [N = 2] 2395 (9 %) 3531 (10 %)
Belgium [N = 1] 257 (1 %) 257 (1 %)
Brazil [N = 1] 420 (2 %) 420 (1 %)
Denmark [N = 2] 1905 (7 %) 2563 (7 %)
Estonia [N = 1] 643 (2 %) 643 (2 %)
Norway [N = 1] 364 (1 %) 364 (1 %)
Portugal [N = 1] 1070 (4 %) 1174 (3 %)
Switzerland [N = 2] 742 (3 %) 742 (2 %)
UK [N = 5] 10,301 (37 %) 14,424 (41 %)
USA [N = 4] 9540 (35 %) 11,242 (32 %)
  1. UK = United Kingdom, USA = Unites States of America
  2. † For individuals measured more than once, the participant characteristics give age and weight status at baseline while the time point characteristics give age and weight status during the measurement period in question
  3. ‡Numbers add up to less than the total for weight status because of missing data on 1 % of participants