The Avon Longitudinal Study of Parents and Children (ALSPAC): Children of the 90s Study Description.

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The Avon Longitudinal Study of Parents and Children (ALSPAC): Children of the 90s Study Description

KEY FEATURES Population based Geographically defined Recruited during pregnancy Detailed follow-up, including hands-on measures Linked biological samples

All pregnant women resident in Avon Expected date of delivery 1.4.91-31.12.92 Recruited through antenatal clinics

RECRUITMENT 14,541 pregnancies (14,472 outcome known) 14,676 fetuses  14,062 live births 13,988 children alive at 1 year 542 children added at age 7 years 10% sample (Children in Focus) attended clinics 4 months - 5 years (n = 1,432)

ALSPAC Avon Rest of UK Owner-occupier 79.1 68.7 63.4 1+ person per room 33.5 26.0 30.8 Car in household 90.8 83.7 75.6 Married couple 79.4 71.7 71.8 Non-white mother 2.2 4.1 7.6

Cohort retention Age of child (months) 0% 10% 20% 30% 40% 50% 60% 70% 80% 90% 100% -10 10 20 30 40 50 60 70 80 90 Age of child (months)

4 questionnaires to mother in pregnancy DATA - QUESTIONNAIRES Questionnaires to: Mother about herself Mother’s partner Mother about Child 4 questionnaires to mother in pregnancy 6 months after birth and annual thereafter

DATA – HANDS-ON Children in Focus – 4m-5y Whole cohort – Annual clinics 7-15 years Current status – 17 year clinic running Multifaceted study of health, development and disease of children

Measures based on scientific priority (& cost) FOCUS AT 7 Eight sessions of 20 min Total clinic 2h 40min Measures based on scientific priority (& cost) 17+ clinic c.£3m M: Measures session A: Allergy session W: Word session C: Coordination session B1: First blood session B2: Second blood session V: Vision session H: Hearing session

Blood (most <5 y gone); later fasting blood for metabolic studies BIOLOGICAL SAMPLES DNA maternal, cord & 7y venous blood; transformed cell lines in progress DNA 10,000 mothers and children C. 1,000 partners Aim for 6,000 trios at end of current programme Blood (most <5 y gone); later fasting blood for metabolic studies Placentae, hair, teeth, urine (cotinine @ 8y and 15y)

ENVIRONMENT Mostly questionnaire based; but dating back to pregnancy Some small validation studies (NO2, salivary cortisols, etc.) Modelling pollution exposures Strengths: Diet (FFQ & diaries); Smoking; Pollution; Activity and body mass (accelerometers & DXA scans @ 9, 11, 13 years)

ASTHMA & ALLERGY Questionnaire data on wheezing, asthma, eczema & hay fever from 6m-17y Skin exam for eczema @ 5y (CiF) & 7y SPTs and total serum IgE @ 7y Spiro & BR methacholine @ 8y Spiro & FeNO & BD reversibility @ 15y

GWAS – CURRENT STATUS 1,400 samples Illumina 317k (WTCCC) 1,250 asthma case:control Illumina 610k (GABRIEL II) Expect asthma candidates on c.7,000 (GABRIEL Phase III) Applying for genome wide typing of whole cohort (?????)

http://www.bris.ac.uk/alspac