Psychometric properties of the M-CHAT-R and M-CHAT-R/F

Test characteristic	M-CHAT-R*	M-CHAT-R/F^¶
Sensitivity (95% CI)	91% (86-96)	85% (79-92)
Specificity (95% CI)	96% (95-96)	99.3% (99-99)
Negative predictive value	99.9%	99.99%
Positive predictive value for ASD	14%	48%
Positive predictive value for any developmental concern, including ASD (95% CI)	Not reported	95% (92-98)

M-CHAT-R: Modified Checklist for Autism in Toddlers, Revised; M-CHAT-R/F: MCHAT-R with follow-up interview; CI: confidence interval; ASD: autism spectrum disorder.
* Total score of ≥3 on MCHAT-R with no follow-up interview.
¶ Total score of ≥3 on MCHAT-R and ≥2 on the follow-up interview.

Data from: Robins DL, Casagrande K, Barton M, et al. Validation of the Modified Checklist for Autism in Toddlers, Revised With Follow-up (M-CHAT-R/F). Pediatrics 2014; 133:37.

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Psychometric properties of the M-CHAT-R and M-CHAT-R/F