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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
| 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 %) |
