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

BMC Public Health

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

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	[58–60]	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
CLAN^a	[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	[31–33]	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

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.

ISSN: 1471-2458