Table 3.

Biological measures from children

Measure	Description	N with data at baselineA	N with data at 1-year follow-upA
Pre-screening	For saliva sample: when last ate, brushed teeth, dental work	1590	985
	For hair sample: frequency of hair washing, use of hair dye/henna, etc.	1592	999
Biometric	Height, weight, waist and hip circumferenceB	912C	978
DNA from salivaD	Genome-wide genotyping (Illumina Infinium Global Screening Array)	1460	945
	Genome-wide methylation (Illumina Infinium MethylationEPIC Array)	1533	947
Neuroendocrine measures from hairD	Cortisol (ELISA)	1589	934
	Dehydroepiandrosterone (ELISA)	1589	934
	Testosterone (ELISA)	1589	934

^ANumber of children with data after data cleaning

^BNumber with a minimum of both height and weight measurement for whom it is possible to calculate BMI

^CBiometric data were not collected during the first 5 weeks of data collection resulting in missing data for approx. 40% of the baseline sample

^DNumber of samples with data which were sent for each analysis; this work is ongoing therefore the final number of samples for each assay may differ once quality control has been completed