Maelstrom Research Staging

QNTS_100months

Networks -

Variables -

Associated study QNTS Contingency Table

Population

QNTS - Twins born between 1995-1998

The population is composed of twins born between 1995 and 1998 in the greater Montreal area and their parents.

Selection Criteria

Newborns

Twins

Countries

Canada

Territory

Greater Montreal area

Ethnic Origin

Health Status

Recruitment

Sources of recruitment

General population

General Population

Selected sample

Supplementary Information

Recruitment began using the Quebec Newborn Twin Registry to identify all twin births in Quebec between April 1995 and December 1998. Names, addresses, and phone numbers of all the mothers of newborn twins were collected from the computerized birth records of the Quebec Bureau of Statistics.

Number of Participants

Number of Participants

1,410

Number of Participants with Biological Samples

1,043

Supplementary Information about selection criteria

5 months: 662 families
18 months: 566 families
30 months: 524 families
48 months: 442 families
60 months: 446 families
Kindergarten: 402 families
Grade 1: 476 families
100 months: 375 families (Genotyping), 150 pairs (Neuropsychological assessments)
Grade 3: 393 families
Grade 4: 444 families
Grade 6: 406 families
Secondary 1: 410 families
Secondary 2: 404 families
Secondary 3: 403 families
Secondary 5: 381 families

Biological samples: 562 twins and 481 parents

More info

Data Collection Event

QNTS - 100 months

Information about health, parenting and behaviour was collected through questionnaires and semi-structured interviews.

Intelligence was assessed using the Wechsler Intelligence Scale for Children. Also, symptoms of inattention, impulsiveness, and hyperactivity were assessed through a battery of different neuropsychological tests, including a mixed go/no-go and stop task (measuring both restrain and cancellation in a single paradigm), continuous performance task (oddball), and a visuospatial working memory task.

Brain electrical activity was also recorded using a large array of electrodes (electroencephalography/event-related potential (EEG/ERP)) during these tests, and brain anatomical magnetic resonance imaging data was collected.

Blood and saliva samples were collected for the genotyping of parents and twins.

More info

Collected Dataset / QNTS_100months

QNTS_100months

Population

QNTS - Twins born between 1995-1998

Data Collection Event

QNTS - 100 months

Files

Variables Classifications