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Table 4 Q-CHAT item descriptives at 18 (n = 368) and 24 months (n = 396) and test-retest reliability and differences between mean item scores at 18 and 24 months (n = 294)

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

  18 M 24 M p*** Difference Effect size of difference
Mean (SD) Mean (SD) z r
1. Looks when name called 0.50 (0.7) 0.49 (0.7) .49 −.37b .02
2. Eye contact 0.62 (0.7) 0.56 (0.7) .46 −1.43b .08
3. Lines objects upa 1.72 (1.0) 2.13 (1.0) .38 −5.57***c .38
4. Understand child’s speech 2.07 (1.1) 1.59 (0.9) .45 −5.88***b .34
5. Protoimperative pointing 0.32 (0.7) 0.52 (0.8) .27 −3.92***c .23
6. Protodeclarative pointing 0.61 (0.9) 0.67 (0.9) .40 −1.08c .06
7. Interest maintained by spinning objecta 1.26 (1.0) 1.26 (1.0) .42 −.30b .02
8. Number of wordsa 2.71 (0.8) 2.01 (1.0) .57 −10.69***b .62
9. Pretend play 0.91 (1.0) 1.4 (1.2) .37 −6.59***c .38
10. Follows a look 0.86 (0.9) 0.99 (0.9) .43 −2.66**c .15
11. Sniffs/licks unusual objectsa 2.03 (1.3) 1.38 (1.2) .32 −7.19***b .42
12. Uses hand as toola 3.02 (1.2) 2.8 (1.2) .28 −2.11*b .12
13. Walks on tiptoesa 1.48 (1.2) 1.36 (1.0) .51 −1.36b .08
14. Adapts to changes in routine 0.95 (0.6) 1.01 (0.7) .19 −1.64c .10
15. Offers comfort 1.56 (1.2) 1.46 (1.1) .57 −2.29*b .13
16. Does same thing over and over againa 2.93 (1.1) 2.32 (1.3) .44 −7.21***b .42
17. Typicality of first words 0.99 (1.1) 0.72 (0.8) .27 −3.76***b .22
18. Echolaliaa 2.67 (1.2) 2.96 (1.2) .38 −4.24***c .25
19. Gestures 0.31 (0.6) 0.39 (0.7) .36 −1.33c .08
20. Unusual finger movementsa 1.49 (1.4) 1.19 (1.3) .47 −3.30**b .19
21. Checks reaction 1.24 (1.0) 1.34 (1.0) .37 −1.45c .08
22. Maintenance of interesta 1.16 (1.0) 1.33 (1.0) .42 −1.91c .11
23. Twiddles objects repetitivelya 2.14 (1.2) 1.54 (1.2) .39 −7.59***b .44
24. Oversensitive to noisea 1.44 (1.1) 1.29 (1.0) .33 −1.66b .10
25. Stares at nothing with no purposea 0.59 (0.9) 0.49 (0.84) .35 −1.17b .07
  1. *p < .05, **p < .01, ***p < .001 (all ρ correlations have p < .001 in this table)
  2. aReverse-scored items
  3. bWilcoxon signed-rank test z-scores based on positive ranks
  4. c z-scores based on negative ranks