Primary and secondary outcomes from the Wechsler Abbreviated Scale of Intelligence* at 7 years’ corrected age
| Outcome | High-DHA diet mean (SD) N=291 | Standard-DHA diet mean (SD) N=313 | Unadjusted treatment effect (95% CI) | Unadjusted p Value | Adjusted treatment effect (95% CI)† | Adjusted p Value† |
|---|---|---|---|---|---|---|
| Primary | ||||||
| Full Scale IQ | 98.3 (14.0) | 98.5 (14.9) | −0.3 (−2.9 to 2.4) | 0.85 | −0.3 (−2.9 to 2.2) | 0.79 |
| Secondary | ||||||
| Verbal IQ | 98.0 (14.2) | 98.8 (15.8) | −0.7 (−3.5 to 2.0) | 0.59 | −0.9 (−3.5 to 1.8) | 0.52 |
| Performance IQ | 98.5 (14.5) | 98.5 (13.6) | 0.0 (−2.5 to 2.6) | 0.98 | −0.0 (−2.5 to 2.5) | 0.99 |
| Number (%) Full Scale IQ <85‡ | 40 (13.6) | 44 (14.1) | 1.0 (0.6 to 1.5) | 0.87 | 1.0 (0.6 to 1.5) | 0.84 |
| Number (%) Full Scale IQ <70§ (n=286/296) | 3 (1.0) | 5 (1.7) | 0.73 | |||
Values are mean (SD) and treatment effects are mean difference based on imputed data unless otherwise indicated.
*Wechsler Abbreviated Scale of Intelligence IQ, the mean (SD) score is 100 (15), range 50–160.
†Adjusted for sex, birth weight (<1250 or ≥1250 g) and recruiting centre.
‡Treatment effect is relative risk.
§Raw data used due to the small number of cases; compared using the Fisher exact test.
DHA, docosahexaenoic acid.