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Table 3 Distribution (%) of Q-CHAT’s item ratings at 18 (18 M) and 24 months (24 M)

From: The psychometric properties of the Quantitative-Checklist for Autism in Toddlers (Q-CHAT) as a measure of autistic traits in a community sample of Singaporean infants and toddlers

  Q-CHAT item ratings (%)
  0 1 2 3 4
Q-CHAT items 18 M 24 M 18 M 24 M 18 M 24 M 18 M 24 M 18 M 24 M
1. Looks when name called 60.3 60.4 30.4 31.6 7.9 6.8 1.4 1.3 0.0 0.0
2. Eye contact 46.7 52.3 45.7 40.2 6.8 6.8 0.8 0.5 0.0 0.3
3. Lines objects upa 10.1 6.1 32.6 17.4 37.8 45.5 14.7 19.9 4.9 11.1
4. Understand child’s speech 9.0 10.9 20.4 35.1 39.9 41.2 16.6 9.8 14.1 3.0
5. Proto-imperative pointing 76.4 64.1 17.7 23.5 4.6 9.6 0.8 1.8 0.5 1.0
6. Proto-declarative pointing 59.5 54.5 25.8 29.0 10.6 12.4 2.2 2.8 1.9 1.3
7. Interest maintained by spinning objecta 19.8 21.2 46.7 47.5 23.1 19.7 7.9 7.6 2.4 4.0
8. Number of wordsa 1.4 10.6 3.8 11.1 31.5 49.7 48.6 23.7 14.7 4.8
9. Pretend play 40.8 24.5 35.6 35.4 18.8 23.0 1.9 10.1 3.0 7.1
10. Follows a look 41.3 33.6 37.5 41.9 16.0 18.9 4.6 3.3 0.5 2.3
11. Sniffs/licks unusual objectsa 17.4 25.8 19.3 35.1 21.2 20.7 27.2 2.6 14.9 5.8
12. Uses hand as toola 6.5 6.3 4.3 7.8 14.9 19.2 29.1 32.6 45.1 34.1
13. Walks on tiptoesa 27.2 24.5 19.8 28.3 37.2 37.6 9.5 5.8 6.3 3.8
14. Adapts to changes in routine 19.8 17.7 67.1 68.2 11.7 11.1 1.1 1.5 0.3 1.5
15. Offers comfort 20.9 23.5 29.1 28.8 29.6 31.3 13.6 11.4 6.8 5.1
16. Does same thing over and over againa 5.2 12.1 6.8 14.1 16.8 23.2 32.1 30.3 39.1 20.2
17. Typicality of first words 37.0 43.4 44.6 47.0 8.4 6.1 3.0 1.5 7.1 2.0
18. Echolaliaa 9.0 6.3 9.0 5.1 16.6 15.9 37.5 32.1 28.0 40.7
19. Gestures 75.0 68.2 19.6 25.5 4.6 5.6 0.8 0.3 0.0 0.5
20. Unusual finger movementsa 38.0 44.2 14.4 18.9 17.4 16.9 20.7 13.1 9.5 6.8
21. Checks reaction 25.5 22.7 38.0 33.6 24.7 33.3 10.3 7.8 1.4 2.5
22. Maintenance of interesta 30.4 22.2 36.4 36.6 22.8 30.3 7.1 7.6 3.3 3.3
23. Twiddles objects repetitivelya 12.2 23.7 16.0 28.0 27.2 24.7 34.5 17.9 10.1 5.6
24. Oversensitive to noisea 17.1 22.7 42.4 39.6 25.0 27.0 10.3 7.3 5.2 3.3
25. Stares at nothing with no purposea 64.9 67.9 17.4 19.2 12.5 9.1 3.8 3.0 1.4 0.8
  1. aReverse-scored items