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Author: Hofer, Scott M.
Resulting in 1 citation.
1. Wanstrom, Linda
O'Keefe, Patrick
Clouston, Sean A. P.
Mann, Frank D.
Muniz-Terrera, Graciela
Voll, Stacey
Zhang, Yun
Hofer, Scott M.
Rodgers, Joseph Lee
It Runs in the Family: Testing for Longitudinal Family Flynn Effects
Journal of Intelligence 11,3 (March 2023): 50.
Cohort(s): Children of the NLSY79, NLSY79
Publisher: MDPI (Multidisciplinary Digital Publishing Institute)
Keyword(s): Age at First Birth; Flynn Effect; Modeling, Growth Curve/Latent Trajectory Analysis; Peabody Individual Achievement Test (PIAT- Math); Peabody Individual Achievement Test (PIAT- Reading)

Permission to reprint the abstract has not been received from the publisher.

The Flynn effect refers to increases over time in measured (particularly fluid) intelligence of approximately 3 IQ points per decade. We define the Flynn effect at the family level, using longitudinal data and two new family-level cohort definitions. Multilevel growth curve analyses of the National Longitudinal Survey of Youth 1979 data showed that children in families with later-born mothers had higher average PIAT math scores, and lower average reading comprehension scores and growth, in young and middle childhood. Children in families where the first child was born later had higher average PIAT math, reading recognition, and reading comprehension scores, as well as larger developmental growth. The latter family-level Flynn effects were of higher magnitudes than the usual individual-level Flynn effect found in previous studies. Our results, showing family level-intercept and slope Flynn effects for both maternal birthyear and first child birthyear, have implications for research aiming to explain the Flynn effect.
Bibliography Citation
Wanstrom, Linda, Patrick O'Keefe, Sean A. P. Clouston, Frank D. Mann, Graciela Muniz-Terrera, Stacey Voll, Yun Zhang, Scott M. Hofer and Joseph Lee Rodgers. "It Runs in the Family: Testing for Longitudinal Family Flynn Effects." Journal of Intelligence 11,3 (March 2023): 50.