Table 1.

Outline of the status/locations of the measures in the Jintan Cohort Study

Measures/instrumentsb	Status	Locations	Status	Child age (years)
Enrolments (informed consent)a	Baseline	Pre-school	General consent completed	3–5
Blood sample collection	Baseline	Pre-school	Completed in 2004–2005	3–5
Blood assay: lead (graphite furnace atomic absorption spectrophotometry)	Baseline	Shanghai Lead Prevention Center	Completed in 2005	4–5
Blood assay: micronutrients	Baseline	Pre-school	Completed in 2005	4–5
IQ testing: age 5 years (WPPSI–R)	First follow-up	Pre-school	Completed in 2005–2007	5–6
Growth data: height/weight	First follow-up	Pre-school	Completed in 2005–2007	4–6
Health data	First follow-up	Pre-school	Completed in 2005–2007	5–6
Retrospective birth complication
Infant developmental data
Breastfeeding history
Secondhand smoking exposure
Nutrition survey
Sleep behaviour
Demographic/psychosocial data	First follow-up	Pre-school	Completed in 2005–2007	5–6
Parental education, occupation
Marital status
Size of house
Neighbourhood environment
Child-rearing disagreement
Parental report
Child behaviour checklist (CBCL, TRF)	First follow-up	Pre-school	Completed in 2005–2007	5–6
Academic records	Second follow-up	Elementary school	On going 2008	7–10 Grades 1–4
IQ testing: age 10–12 (WISC)	Second follow-up	Elementary school	Planned	10–12 Grades 4–6
Health data Nutrition survey	Second follow-up	Elementary school	Planned	10–12 Grades 4–6
Social competency and peer relationship	Second follow-up	Elementary school	Planned	10–12 Grades 4–6
Child behaviour checklist: (CBCL/TRF/YSR)	Second follow-up	Elementary school	Planned	10–12 Grades 4–6

^aGeneral consent has been obtained from the subjects during the first phase of blood drawing.

^bRAs are Pediatric Nurses (R.N., B.S.) who received training in IQ testing and data collection.