Individual Study / QNTS

Quebec Newborn Twin Study

Quebec Newborn Twin Study

Initiatives -
The goals of the Quebec Newborn Twin Study (QNTS) are to document individual differences in the cognitive, behavioral, social-emotional aspects of developmental health across childhood, their early biosocial, i.e., genetic and environmental, determinants, as well as their putative role in later social-emotional adjustment, school and health outcomes. Objectives: * To identify the environmental factors that influence the different aspects of children's behaviour. * To study the evolution over time of biological and social aspects of childhood development. * To understand the origin of the diffences and similarities that exist between children born at the same time and who share the same milieu.
Start Year
End Year
National Program for the Research of Health Development, the Health Research Fund of Québec and the Québec Council for Social Research
Visit QNTS


Investigators Contacts
  • Dr. Prof. Michel Boivin
    Laval University


Study design
Population cohort
Follow Up
Children are met with at 5, 18, and 30 months of age and evaluated with a series of behavioural and physiological measures; parents are also evaluated with the help of measures of parental behaviour and attitude. QNTS has 14 waves of data collected or planned, including 5 in preschool.

Marker Paper

Boivin M, Brendgen M, Dionne G, et al. The Quebec Newborn Twin Study into adolescence: 15 years later. Twin Res Hum Genet. 2013;16(1):64-69. doi:10.1017/thg.2012.129

PUBMED 23200437


Sources of Recruitment
  • Individuals
  • Families

Number of participants

Number of participants
Number of participants with biosamples
Supplementary Information
Pairs of twins, born in the greater Montréal area between the 1st of April 1995 and the 31st of December 1998, and their parents.


Availability of data and biosamples


Availability of access information

On the study website :