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Table 1 Comparison of key demographics between the Q-CHAT sample at 18 and 24 months and the full active GUSTO cohort

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 24 months Active GUSTO cohort n = 1089 Statistics (differences between 18 M Q-CHAT and active GUSTO) Statistics (differences between 24 M Q-CHAT and active GUSTO)
Q-CHAT Q-CHAT
n = 368 n = 396
Maternal age, years (SD) 30.3 (5.2) 30.5 (5.2) 30.8 (5.1) t(367) = −1.75, p = .08, d = .10 t(395) = −1.29, p = .20, d = .06
Ethnicity      
Chinese 195 (53.0 %) 232 (58.6 %) 616 (56.6 %) χ 2(2) = 10.64, p = .01, w = .17 χ 2(2) = 7.35, p = .03, w = .14
Malay 119 (32.3 %) 113 (28.5 %) 277 (25.4 %)
Indian 53 (14.4 %) 51 (12.9 %) 196 (18.0 %)
Highest maternal education level      
None/primary 14 (3.8 %) 16 (4.0 %) 42 (3.9 %) χ 2(2) = 0.31, p = .86, w = .03 χ 2(2) = 0.15, p = .93, w = .02
Secondary/technical education 126 (34.2 %) 139 (35.1 %) 392 (36.0 %)
GCE ‘A’ levels/polytechnic/university/others 223 (60.6 %) 240 (60.6 %) 655 (60.1 %)
Household monthly income, SGDa      
0–999 9 (2.4 %) 8 (2.0 %) 22 (2.2 %) χ 2(4) = 0.76, p = .94, w = .05 χ 2(4) = 0.11, p =1.00, w = .02
1000–1999 44 (12.0 %) 49 (12.4 %) 136 (13.3 %)
2000–3999 106 (28.8 %) 113 (28.5 %) 304 (29.8 %)
4000–5999 85 (23.1 %) 92 (23.2 %) 254 (24.9 %)  
≥6000 102 (27.7 %) 114 (28.8 %) 303 (29.7 %)  
  1. aAccording to the Department of Statistics Singapore, in 2013, median household income for Singaporean/Permanent Resident families with at least one working member was SGD7870