So this is what they were going to do in their trial: They were taking 3,000 children, they were going to give them these huge fish oil pills, six of them a day, and then, a year later, measure their school exam performance and compare their performance against what they predicted their exam performance would have been if they hadn't had the pills.
Esto es lo que iban a hacer en este ensayo. Iban a tomar a 3.000 niños, iban a darles estas enormes píldoras, 6 al día, y, un año después, iban a evaluar su rendimiento en exámenes escolares y comparar este rendimiento con la previsión del rendimiento de los mismos de no haber tomado las píldoras.