ASD is usually diagnosed by the age of 36 months, based on diagnostic instruments such as the ADOS (Lord et. al. 1989),
options()$works_cited
## Lord C, Rutter M, Goode S, Heemsbergen J, Jordan H, Mawhood L and
## Schopler E (1989). "Autism diagnostic observation schedule: a
## standardized observation of communicative and social behavior."
## _Journal of autism and developmental disorders_, *19*(2), pp.
## 185-212. ISSN 0162-3257, <URL:
## http://www.ncbi.nlm.nih.gov/pubmed/2745388>.
ADI-R (Lord et. al. 1994)
options()$works_cited
## Lord C, Rutter M, Goode S, Heemsbergen J, Jordan H, Mawhood L and
## Schopler E (1989). "Autism diagnostic observation schedule: a
## standardized observation of communicative and social behavior."
## _Journal of autism and developmental disorders_, *19*(2), pp.
## 185-212. ISSN 0162-3257, <URL:
## http://www.ncbi.nlm.nih.gov/pubmed/2745388>.
and CARS (Schopler et. al. 1980; Paul et. al. 2005); however, symptoms may become apparent early at childhood (Paul et. al. 2005).
options()$works_cited
## Lord C, Rutter M, Goode S, Heemsbergen J, Jordan H, Mawhood L and
## Schopler E (1989). "Autism diagnostic observation schedule: a
## standardized observation of communicative and social behavior."
## _Journal of autism and developmental disorders_, *19*(2), pp.
## 185-212. ISSN 0162-3257, <URL:
## http://www.ncbi.nlm.nih.gov/pubmed/2745388>.
Lord C, Rutter M, Goode S, Heemsbergen J, Jordan H, Mawhood L and Schopler E (1989). “Autism diagnostic observation schedule: a standardized observation of communicative and social behavior.” Journal of autism and developmental disorders, 19(2), pp. 185–212. ISSN 0162-3257, http://www.ncbi.nlm.nih.gov/pubmed/2745388.
sessionInfo()
## R version 2.15.0 (2012-03-30)
## Platform: x86_64-pc-mingw32/x64 (64-bit)
##
## locale:
## [1] LC_COLLATE=English_United States.1252
## [2] LC_CTYPE=English_United States.1252
## [3] LC_MONETARY=English_United States.1252
## [4] LC_NUMERIC=C
## [5] LC_TIME=English_United States.1252
##
## attached base packages:
## [1] stats graphics grDevices utils datasets methods base
##
## other attached packages:
## [1] knitcitations_0.1-0 bibtex_0.3-3 knitr_0.8
##
## loaded via a namespace (and not attached):
## [1] codetools_0.2-8 digest_0.5.2 evaluate_0.4.2 formatR_0.6
## [5] pkgmaker_0.8.5 plyr_1.7.1 RCurl_1.91-1.1 stringr_0.6.1
## [9] tools_2.15.0 XML_3.9-4.1 xtable_1.7-0