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

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

	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 tool^b	−0.423	0.241	−0.147
15. Offer comfort	0.313	−0.139	−0.210
23. Twiddle objects repetitively^b	−0.007	0.628	0.043
20. Unusual finger movements^b	−0.065	0.540	−0.013
25. Stare at nothing with no purpose^b	0.142	0.475	0.016
24. Oversensitive to noise^b	0.093	0.453	0.019
16. Do same thing over and over again^b	−0.195	0.452	−0.072
11. Sniff/lick unusual objects^b	−0.112	0.419	−0.118
7. Interest maintained by spinning object^b	0.002	0.347	0.057
22. Maintenance of interest^b	−0.087	0.339	0.183
8. Number of words^b	−0.059	0.066	−0.666
18. Echolalia^b	−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

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
^aItems 3, 13, and 14 excluded due to loading <0.3
^bReverse-scored items