Reply to Moffitt et al.: Causal inference from observational data remains difficult

Comment

Ole Rogeberg. Proc Natl Acad Sci U S A. 2013.

. 2013 Mar 12;110(11):E983.

doi: 10.1073/pnas.1301881110.

No abstract available

Conflict of interest statement

The author declares no conflict of interest.

Correlations between cannabis use and IQ change in the Dunedin cohort are consistent with confounding from socioeconomic status.
Rogeberg O. Rogeberg O. Proc Natl Acad Sci U S A. 2013 Mar 12;110(11):4251-4. doi: 10.1073/pnas.1215678110. Epub 2013 Jan 14. Proc Natl Acad Sci U S A. 2013. PMID: 23319626 Free PMC article.
Reply to Rogeberg and Daly: No evidence that socioeconomic status or personality differences confound the association between cannabis use and IQ decline.
Moffitt TE, Meier MH, Caspi A, Poulton R. Moffitt TE, et al. Proc Natl Acad Sci U S A. 2013 Mar 12;110(11):E980-2. doi: 10.1073/pnas.1300618110. Proc Natl Acad Sci U S A. 2013. PMID: 23599952 Free PMC article. No abstract available.

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. 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. Moffitt TE, Meier MH, Caspi A, Poulton R. Reply to Rogeberg and Daly: No evidence that socioeconomic status or personality differences confound the association between cannabis use and IQ decline. Proc Natl Acad Sci USA. 2013 doi: 10.1073/pnas.1300618110. - DOI - PMC - PubMed
1. Daly M. Personality may explain the association between cannabis use and neuropscyhological impairment. Proc Natl Acad Sci USA. 2013 doi: 10.1073/pnas.1218571110. - DOI - PMC - PubMed
1. New Zealand Herald (2001) Study clears drug as root of violence, July 18, 2001, New Zealand Herald (APN Holdings NZ, Christchurch, New Zealand). Available at www.nzherald.co.nz/nz/news/article.cfm?c_id=1&objectid=200666. Accessed ....