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Table 2 Total and Factor Q-CHAT raw scores at 18 and 24 months

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 months (n = 368) 24 months (n = 396) Statistics
  M (SD) Range M (SD) Range Difference between Q-CHAT scores at 18 and 24 months Relationship between Q-CHAT scores at 18 and 24 months (r)
Q-CHAT 25 (total) 35.57 (7.21) 12–59 33.20 (7.70) 9–59 t(293) = 6.01, p < .0001, d = .32 .64***
Q-CHAT social-communicative ALTs (factor 1; 10 items) 9.94 (4.18) 2–27 10.62 (4.51) 2–33 t(293) = −3.17, p = .002, d = .16 .64***
Q-CHAT non-social/behavioral ALTs (factor 2; 8 items) 13.05 (5.11) 0–31 10.80 (5.14) 0–26 t(293) = 8.62, p < .0001, d = .45 .60***
Q-CHAT speech/language (factor 3; 4 items) 8.43 (2.02) 3–16 7.28 (1.73) 1–12 t(293) = 8.94, p < .0001, d = .56 .43***
  1. ***p < .001