Data also suggested slight phase shifts for BMAL1, DKK1, and CRY1 (peaking later in ADHD, i.e., 14.03 vs. 13.07, 12.54 vs. 10.97, 9.89 vs. 8.99, respectively), as well as PER2 and PER3 (shifting toward an earlier phase in ADHD, i.e., 5.36 vs. 5.74, 1.87 vs. 3.18, respectively). This evidence concerns the gene PER2 and attention deficit-hyperactivity disorder.