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Table 1 Details of the 20 studies that contributed data to the International Children's Accelerometry Database (ICAD)

From: International children's accelerometry database (ICAD): Design and methods

Study Name*   Yrs Months ** Country Study design N Waves N Subjects N Files Age (y) Model Epoch Days***
ALSPAC [56] 03-07 All England Long. 2 6060 10811 10-15 7164,
71256,GT1M
60 7
Ballabeina Study [57] 08-09 June-Sept Switzerland Inter. 2 403 988 4-8 GT1M 15 5
Belgium Pre-School Study [5860] 06; 08-09 Oct-March Belgium Cross. 1 433 433 3-7 GT1M 15 2-4
CHAMPS (UK) [61, 62] 06-07 Nov-May England Cross. 1 562 562 3-17 GT1M 60 7
CHAMPS (US) [63] 03-06 All United States Cross. 1 469 469 3-6 7164 10 4
CLANa [21, 64, 65] 01; 04; 06 March-Dec Australia Long. 3 1126 2065 5-18 7164, GT1M 60, 20 6
CSCIS [66, 67] 01-05 Oct-May Denmark Inter. 2 615 1150 6-11 7164 60 4
EYHS (Denmark) [68, 69] 97-98; 03-04 All Denmark Closed Cohort 2 1308 1739 8-18 7164 60 4
EYHS (Estonia) [69] 98-99 Aug-May Estonia Cross. 1 662 662 8-17 7164 60 4
HEAPS [70, 71] 02-03; 06 Feb-Dec Australia Long. 2 1362 1714 4-16 7164,GT1M 60 7
Iowa Bone Development Study [72, 73] 98-07 Sept-Dec United States Long. 4 437 1996 5-15 7164 60 4-5
KISS [74] 05-06 May-Nov Switzerland Inter. 2 433 909 6-14 7164, GT1M 60 7
MAGIC [75] 02 Sept-Oct Scotland Cross. 1 462 462 4-5 7164 60 6
NHANES [8, 9, 76, 77] 03-04; 05-06 All United States Cross. 2 5174 4970 6-18 GT1M 60 7
EYHS (Norway) [69, 78] 99-00 Feb-June; Oct Norway Cross. 1 391 391 9-10 7164 60 4
PEACH [79] 06-09 Sept-July England Long. 2 1232 2091 10-13 GT1M 15 7
Pelotas 1993 Birth Cohort [3133] 06-07 Aug-Feb Brazil Cross. 1 457 457 13-14 GT1M 5 4
Portugal EYHS [69, 80] 99-00 Jan-July Portugal Long. 2 1242 1386 8-18 GT1M 60 4
Project TAAG [81, 82] 02-06 Oct-May United States Closed Cohort Inter. 2 7148 8995 10-17 7164 30 7
SPEEDY [7, 6, 83] 07 Feb-July England Cross. 1 2000 2000 9-11 GT1M 5 7
       Total 31976 44544     
  1. Note: *See Additional file 1, Table S8 for full name of study; ** Approximate months during which data collection (across all waves) occurred; *** Days = Number of days of Actigraph deployment. N Files = the total number of files contributed from each study that are present in the database (excluding spurious and 'temporally shifted' files); Long - Longitudinal; Cross = Cross-sectional; Inter. = Intervention. Note: the number of participants will differ from the number of files when a study has repeated measures on the same individual (e.g. longitudinal and or closed cohort design); a Baseline wave of CLAN was named CLASS ("Children's Leisure Activities Study") in early publications.