Image for DHQ Time of Data Acquisition
Three timelines from T0 to T13 showing the collection of diet history questionnaires (DHQ) from both arms in the trial. The first timeline is for 27,000 participants randomized before December 1995. The DHQ was completed between T4 and T6. The second timeline is for 56,000 participants randomized between December 1995 and December 1998. The DHQ was completed around T3 for both arms, but the collection from the control arm is over a slightly wider range than the intervention arm. The third timeline is for 31,000 participants randomized after December 1998. Again, most of the intervention arm completed the DHQ around T3, but the DHQ was completed by the control arm much earlier, around T0.