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Comment
. 2013 Mar 12;110(11):E980-2.
doi: 10.1073/pnas.1300618110.

Reply to Rogeberg and Daly: No evidence that socioeconomic status or personality differences confound the association between cannabis use and IQ decline

Terrie E Moffitt, Madeline H Meier, Avshalom Caspi, Richie Poulton
Comment

Reply to Rogeberg and Daly: No evidence that socioeconomic status or personality differences confound the association between cannabis use and IQ decline

Terrie E Moffitt et al. Proc Natl Acad Sci U S A. .
No abstract available

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Conflict of interest statement

The authors declare no conflict of interest.

Figures

Fig. 1.
Fig. 1.
Mean IQ scores for children from low, as well as middle and high, SES backgrounds in the Dunedin cohort. The figure does not support the claim that their IQs were boosted by schooling and dropped thereafter.
Fig. 2.
Fig. 2.
Change in full-scale IQ (in SD units) from childhood to adulthood as a function of the number of study waves between ages 18–38 y for which a study member met criteria for cannabis dependence. The black bars show the results for the full cohort, from our original report (see figure 1 ref. 1). The striped bars show the same pattern of association when the same analysis was restricted to study members from middle class SES backgrounds.
Fig. 3.
Fig. 3.
Change in full-scale IQ (in SD units) from childhood to adulthood among study members with one, two, or three or more diagnoses of cannabis dependence as a function of age of onset of cannabis dependence. Panel A reproduced from ref. . (A) Results for the full cohort, from our original report (see figure 2 in ref. 1). (B) Results when the analysis is restricted to study members from middle class SES backgrounds. Panel B shows the same pattern of association as panel A.
See this image and copyright information in PMC

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References

    1. Meier MH, et al. Persistent cannabis users show neuropsychological decline from childhood to midlife. Proc Natl Acad Sci USA. 2012;109(40):E2657–E2664. - PMC - PubMed
    1. Rogeberg O. Correlations between cannabis use and IQ change in the Dunedin cohort are consistent with confounding from socioeconomic status. Proc Natl Acad Sci USA. 2013 doi: 10.1073/pnas.1215678110. - DOI - PMC - PubMed
    1. Moffitt TE, Caspi A, Harkness AR, Silva PA. The natural history of change in intellectual performance: Who changes? How much? Is it meaningful? J Child Psychol Psychiatry. 1993;34(4):455–506. - PubMed
    1. Daly M. Personality may explain the association between cannabis use and neuropsychological impairment. Proc Natl Acad Sci USA. 2013 doi: 10.1073/pnas.1218571110. - DOI - PMC - PubMed
    1. Caspi A, Roberts BW, Shiner RL. Personality development: Stability and change. Annu Rev Psychol. 2005;56:453–484. - PubMed

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