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Developmental Influences on Adult IntelligenceThe Seattle longitudinal study$
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K. Warner Schaie

Print publication date: 2005

Print ISBN-13: 9780195156737

Published to Oxford Scholarship Online: September 2007

DOI: 10.1093/acprof:oso/9780195156737.001.0001

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Longitudinal Studies

Longitudinal Studies

(p.112) chapter five Longitudinal Studies
Developmental Influences on Adult Intelligence

K. Warner Schaie

Oxford University Press

This chapter reviews the central core of the Seattle Longitudinal Study: the results from the longitudinal inquiries. The longitudinal studies consist of six seven-year follow-ups, five fourteen-year follow-ups, four twenty-one-year follow-ups, three twenty-eight-year follow-ups, two thirty-five-year follow-ups, and one forty-two-year follow-up. The longitudinal database is integrated to provide estimates of age changes based on the largest available number of study participants for each age interval. To permit comparison with the cross-sectional findings, the base mean-level estimates were set to the observed average values across all cohorts for participants tested at age 53 (the average age of the total sample). The average intra-individual age changes aggregated across all cohorts for which each age interval is available were then cumulated and added to or subtracted from these base values. These predicted values are provided for the total sample as well as being separately by gender.

Keywords:   Seattle Longitudinal Study, intellectual development, cross-sectional findings, longitudinal studies, age changes, primary mental abilities, latent constructs

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