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. Now, can anybody spot a flaw in this design?
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. ¿Alguien puede identificar la falla en este diseño?