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Table 5 Pattern matrix (direct oblimin rotation) displaying factor loadings of EFA of the 22 itemsa of the 18-month Q-CHAT

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

  Factors
  1 2 3
10. Follows a look 0.647 −0.005 −0.079
6. Protodeclarative pointing 0.617 −0.007 0.017
1. Looks when name called 0.580 0.137 0.034
19. Gestures 0.527 0.076 −0.111
21. Check reaction 0.506 0.259 −0.142
2. Eye contact 0.459 −0.145 0.006
9. Pretend play 0.445 −0.095 −0.134
5. Protoimperative pointing 0.436 −0.072 0.054
12. Use of hand as toolb −0.423 0.241 −0.147
15. Offer comfort 0.313 −0.139 −0.210
23. Twiddle objects repetitivelyb −0.007 0.628 0.043
20. Unusual finger movementsb −0.065 0.540 −0.013
25. Stare at nothing with no purposeb 0.142 0.475 0.016
24. Oversensitive to noiseb 0.093 0.453 0.019
16. Do same thing over and over againb −0.195 0.452 −0.072
11. Sniff/lick unusual objectsb −0.112 0.419 −0.118
7. Interest maintained by spinning objectb 0.002 0.347 0.057
22. Maintenance of interestb −0.087 0.339 0.183
8. Number of wordsb −0.059 0.066 −0.666
18. Echolaliab −0.176 0.179 0.508
17. Typicality of first words −0.044 −0.025 −0.495
4. Understand child’s speech 0.217 −0.006 −0.481
  1. Extraction Method: Principal Axis Factoring. Rotation Method: Oblimin with Kaiser Normalization. Rotation converged in six iterations. Italicized entries indicate which items load on which factor
  2. aItems 3, 13, and 14 excluded due to loading <0.3
  3. bReverse-scored items